The Invincible Life of Kasugano Yu

My name is Kasugano Yu, I have a lovely and capable younger sister, and a traveler of the comprehensive world.
With three decks in hand: FGO, Ultraman, Unknown deck, and an extra deck of Kamen Rider, I felt like I was invincible, but I was still panicking.
It looks like a good future is not bad...but...
The sick girl Gui Yanye, the flat-chested senpai Kuroyukihime, the artificial angel Icarus, the waste angel Gabriel... and that huge monster... Who can tell me what's going on?
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