Reborn in Tokyo after picking up Sayu who ran away from home

Chapter 566 Theoretical Mechanics
"System, open the store."

The next evening, Kato Yusuke, who was alone at home, studied the system.

[Products: dried fish, wind chime, USB flash drive, portable oxygen cylinder, tracker, beauty cream, Dongyun's scarf, Qi and blood medicine, ordinary version of Wanhe medicine]

(Note: One new purchasable item is added every month.)
【Money: Each point can be exchanged for 100 yen】

(Note: Only one-way exchange is supported, and the exchangeable amount is unlimited.)
[Physical Strength: 1 point/5000 points]

[Charm: 1 point/50000 points]

[Intelligence: 1 point/100000 points]

(After all attributes exceed 10 points, the points required for each exchange point will increase exponentially.)
……

First up is this month's new additions:

[Portable oxygen cylinder: the savior of outdoor sports enthusiasts, you can replenish oxygen anytime and anywhere (100 points). 】

A seemingly useful thing that is rarely used is basically useless.

Kato Yusuke jumped over it.

Followed by this month's skills:
[Entry-level bartending (100), proficient maid (1000), proficient language mastery (10000), master-level pet grooming (100000)】

I don't know if it's because he ran out of luck with the healing medicine refreshed last month, and there is nothing eye-catching in the skills refreshed this month.

What's more, the skilled-level maid whose purpose is unknown is actually blinding people's eyes...

"System, exchange for language mastery."

"Ding, after deducting [-] points, the host will gain proficiency level language mastery."

A huge stream of information poured into my mind.

Kato Yusuke closed his eyes to receive it quietly, and then slowly opened it about 10 minutes later.

Then, he spoke directly to the void.

“Empieza donde estás. Usa lo que tienes. Haz lo que puedas. (Start where you are, use what you have, do what you can.)”

It's pure Spanish.

“Là où on s'aime, il ne fait jamais nuit. (Where there is love, it will never be dark.)”

It's pure French.

"Das Schicksal bestimmt, wer in unser Leben reinkommt. Aber es ist das Herz, das entscheidet, wer innen drin bleibt.
(Fate decides who comes into our lives, and the heart decides who we stand with.)”

It's pure German.

"Meow meow meow meow?"

It's pure...uh, meow language.

Kato Yusuke, who tested the new ability twice, lowered his head and met a pair of green and clear pupils.

The black cat was looking at him with its head tilted, as if curious about his chatter.

Kato Yusuke simply hugged it on his lap, stroked it, and took out his phone.

Randomly found several foreign language movie video clips on the Internet.

Under the condition of not reading the subtitles but listening to the original sound, he found that he could easily understand every sentence in it, as easy as breathing.

Compared with the tasteless oxygen cylinder in front, the practicality of this skill is much higher.

He went on to study.

"System, open the panel."

【Character: Yusuke Kato (The Intruder of Time and Space)】

(Explanation: Time has left traces on you, and your life has been deducted for about ten years, with certain negative effects.)
【Physical Strength: 8】

【Intelligence: 8】

【Charm: 9】

(Evaluation: The posture of dragon and phoenix)

[Items: U disk, qi and blood medicine (17 capsules), tracker (usable number of times 1), memory potion (empty), "Guidelines for Consolidating the Origin and Cultivating Yuan Zhuang Gong"]

[Skills: dodge (entry level), shooting (proficient level), fighting (proficient level), camping (proficient level), language mastery (proficient level), painting (master level)]

【Points: 384170】

Overall, the highly practical skill of "language mastery" has become the only highlight of this month.

Yusuke Kato focused on personal belongings.

With a thought, an empty glass test tube and a book appeared in his palm.

【Memory potion (empty)】

"Consolidating the foundation and cultivating the yuan pile work guide book"

Both props are rewards from the previous [Harem Lord] mission.

Because of his busy work a while ago, he has no time to study these two things until now.

[Memory potion (empty): It can copy and store a user's memory, allowing the person who drinks the potion to experience it from a third-person perspective. 】

Literally, this is a prop that allows one to see someone else's memory.

Kato Yusuke was a little absent-minded, recalling the past involuntarily.

A long time ago, he drank a similar potion.That brought him memories of Fujimoto, and The Saw Man.

Because he had experienced it himself, he knew the feeling after drinking the potion.

- It's like watching a movie.

He can feel the plainness and splendor of it, and he can also personally experience the various emotions of the protagonist, with a strong sense of substitution.

Can be the same.

Although there is a strong sense of substitution, that memory still belongs to the original owner himself, and the audience can only be regarded as a bystander, and cannot really become the other party.

'If I put my memory in, the suffix of this thing should become mine. '

Kato Yusuke thought silently, and took the props back.

"Unfortunately, I have no desire to share, and I have no memories to share with others."

Saw Memory Potion, followed by the next one.

He started to open the "Instruction Book for Consolidating the Foundation and Peiyuan Zhuang Gong", and started to read it casually.

There are a lot of text instructions recorded on it, and there are also corresponding explanatory pictures, which show villains making different actions.

'This system rewards are really not serious. ' Kato Yusuke slandered in his heart, always feeling as if he had been underestimated.

With nothing to do, he decided to try it out.

Put the black cat on the ground, then come to the center of the room and stand there.

While holding the pile exercise instruction book, he followed the instructions above to put on a posture.

Bend your knees and sink your hips, keep your feet shoulder-width apart, tuck your jaw and relax your shoulders, loosen your waist and tighten your hips, open your knees to the sides, and keep your spine centered.

Kato Yusuke closed his eyes slightly, inhaled and moved his palms three times, and finally pushed out his hands and hugged them round his chest.

Focusing on the legs, the muscles of the body suddenly tensed up.

The whole set of movements is a bit similar to the stance of health preservation, and he didn't feel the mystery of any system from it.

'Can this really strengthen the foundation and cultivate the talents...? '

Kato Yusuke was skeptical about this, feeling faintly deceived, but the next second he saw the requirement of "keep the mind free from distracting thoughts", he gave up his wild thinking.

In this way, he quietly practiced Zhuanggong in the room.

At first, the black cat was curious about his behavior, and it kept circling around his feet and meowing, but after seeing that he was still motionless, it quickly lost interest and went to play by itself.

As time passed bit by bit, Kato Yusuke felt his body warm up slightly, and a warmth slowly and steadily emerged from his dantian, spreading to his limbs and bones.

At first, it was as comfortable as a hand warmer.

Gradually, the hand warmer turned into an electric heater, and the electric heater turned into a small stove, making Yusuke Kato frown slightly and sweat slightly at the same time.

The feeling at this time is not so comfortable, but it is still acceptable.

But in the end, he felt like he was hugging a big fireball. Not only did his heart beat a lot faster, he even felt a dry mouth.

He faintly felt that something was wrong, so he immediately stopped standing, took a bottle of oolong tea from the refrigerator and began to drink.

The cold tea poured into the mouth, down the throat and into the stomach, bringing a burst of coolness.

The coolness of the drink temporarily suppressed the heat in his body, making him feel a little better.

But only slightly.

In a short while, the hotness came back again!
Kato Yusuke seemed to have some kind of energy accumulated in his body, which raised his body temperature.

"System, what's going on with this work—?" He asked, but did not receive a response.

He tore off the long sleeves he was wearing, then rushed into the bathroom and turned on the faucet, splashing cold water on his face continuously.

But his body seemed as if it didn't belong to him, and he still refused to calm down obediently.

By now, the heat in his body was no longer under his control.

"This is what you said about strengthening the foundation and cultivating talents!? System!"

Kato Yusuke gritted his teeth and stared at the mirror, his face inside was flushed, his handsome face was faintly ferocious, and veins appeared around his temples.

He took a deep breath, decided to take a cold shower to calm himself down, and when he was about to undress...

ding dong~

——The doorbell was suddenly rang.

Kato Yusuke couldn't help frowning deeply, pulled a bath towel and put it on his shoulders, and then opened the door with heavy steps.

"Which...?"

What appeared in front of me was a mysterious woman wearing a black windbreaker and black high-heeled shoes.

"Yo~"

Benizaka Akane pinched the brim of her hat, slightly raised her gaze, and said hello flirtatiously, "Good evening, brat."

A pair of burgundy eyes narrowed playfully, as if they were reflecting each other with the hair color, and they were passionate.

Kato Yusuke couldn't help being stunned when he saw the person coming, while Benizaka Akane stared at his toned chest muscles exposed from the bath towel, and his eyes couldn't help but move slightly.

"Heh~ what? You just got out of the shower?"

Kato Yusuke was dragged back to reality by her voice, his eyes suddenly became dark, and then he pulled her into the room.

"what……!"

Hongsaka Zhuyin was dragged by him without noticing for a moment, staggered two steps, and crashed into his arms.

Padang——

The sound of the door closing came from behind.

"Hey you--!"

Because of Kato Yusuke's rough action, Benizaka Akane was about to get angry, but was pressed against the wall by an irresistible force.

Immediately afterwards, a muscular body pressed up.

She raised her head subconsciously, and met a pair of wild beast-like fiery black eyes, as if she wanted to swallow herself alive.

Her expression couldn't help but froze, and before she had time to speak, Kato Yusuke bowed his head arrogantly and kissed her lips, asking for anything.

"Hmm—!?"

The heavy masculine breath rushed towards her face, and her hot breath slapped her face, making her heart feel numb.

The other party's fiery breath entered her mouth, and Benizaka Zhuyin felt her waist go weak for a while, but was caught in the next second.

Instinctively, she reached out to push and pressed against his hard chest, her hands were hot and even a little wet.

At this moment, Kato Yusuke tasted the slight smell of smoke and alcohol, and the hotness in his body seemed to find a vent, and became more aggressive, entangled with her.

Benizaka Akane was embarrassed by his aggressive attack, so she put her arms around his neck with her backhand, launched a counterattack and kissed him back, and was entangled by Kato Yusuke.

The air in the hallway heated up, and the sound of each other's swallowing was amplified.

Kato Yusuke slowly raised his hand, his fingers penetrated into her hair, with a sense of domineering.

In just a moment, all of her lipstick was on his face.

After a long time, they finally separated.

Benizaka Akane took a deep breath as if suffocating, and then she had time to look at someone.

She was not ambiguous by the saliva drawn between the two, but was laughed at by the mottled lipstick marks on his mouth.

"Huh, huh... ahahaha, did you take the wrong medicine today?"

Kato Yusuke didn't answer, rubbed the back of his hand around his lips, wiped off the saliva and lipstick, and said in a hoarse voice, "No, I met the antidote."

"An antidote?"

Benizaka Akane frowned in confusion, not understanding the meaning of his words, but in the next second he was picked up by his hips and strode into the bathroom.

"Wait for me! What do you want to do?"

"I'm sweating, I need to take a shower."

Kato Yusuke put her on the sink and took off her clothes while talking.

It was already December, but the other party was wearing a pure black dress when she went out at night. The hem was designed with fluffy tassels, which could barely cover her upturned buttocks, and she didn't know who she was wearing it for.

Click ~ Two high-heeled shoes were thrown on the ground, and then others.

Hongsaka Zhuyin's eyelids tightened slightly, and she scolded with a smile: "You impolite brat, how dare you tell me to wait for you. Anyway, wash yours, I'll wait outside."

As she said that, she wanted to jump off the sink, but Yusuke Kato didn't give her this chance, and put her arms around her waist and came to the side of the shower.

The switch was turned on and hot water flowed out.

Kato Yusuke pressed against her ear and blew a breath of hot air: "Let's go together, little aunt."

There was a wildness in the voice.

"You little bastard... I'm here to talk to you about business!"

Hongsaka Zhuyin blushed, and the canonical transformation had faded away, revealing the original coordinates, with two extreme points pointing straight at him, teasing someone's functional integral.

Kato Yusuke licked his lips, his mouth was a little dry, and he replied calmly: "Little aunt is obedient and don't bother, obediently be my antidote."

Hush, huh, huh.

The sound of the shower and running water resounded in the bathroom, blending harmoniously.

……

"Speaking of which, little aunt, what business do you want to talk about?" Kato Yusuke took the initiative to ask.

"Well...it's nothing, it's just that my Lagrangian has not been calculated by the EL equation for a long time..."

Hongsaka Zhuyin replied hoarsely: "Aren't you very smart? That's why I came to ask you for help."

"I see, this one is not difficult. Then I will derive the equation of motion first, and let me see how your normalized momentum is."

Kato Yusuke began to guess the simple harmonic vibration solution, and the ever-increasing angular velocity made him feel excited.

"Ah! The Ross function doesn't work."

Benizaka Zhuyin said in shock and anger: "It was agreed that only Lagrangian equations will be introduced, why did you use Hamiltonian mechanics!"

Kato Yusuke ignored it and calculated on his own.

Seeing how stubborn he was, Hongsaka Zhuyin finally gave in.

"Okay, Hamilton's canonical equation is not impossible...but you must bring Poisson brackets!"

"Poisson brackets are too cumbersome, let's go straight to the variation!"

Benizaka Zhuyin was caught off guard by the sudden change of mathematical method, and hurriedly tried to stop it, but found that his calculation was about to come to a result.

"Hmm... It seems that I have to find it. My sports points are gone, so I need to count some more. That's right... that's the conserved quantity..."

After a lot of calculations, Benizaka Akane's head went blank and almost exhausted all her energy.

Kato Yusuke stared at the calculated results, frowned, and said, "This is wrong."

"...What's wrong?"

"There is a problem with the calculation result, and we have to recalculate several times."

When Hongsaka Zhuyin heard it, her face paled immediately: "You have to do it yourself, I've had enough of this damn theoretical mechanics! I won't accompany you anymore!"

However, Kato Yusuke disagreed and took her back.

"Little auntie, be obedient. If you don't calculate the correct result today, I won't let you go."

"You bastard--!!"

……

(End of this chapter)