Comprehensive: The peaceful daily life of the strongest human being who opens a restaurant

Once saved the world, as the strongest human being, he decided to retire after the battle, open a restaurant, and spend a peaceful day; learn how to cook during the day, and open for business at night.
But he soon discovered that the customers who came to the store were a little different.
Nakiri Erina, who came here as an assistant, always gives amazing advice;
There is also a beautiful blonde girl who likes to draw all night in the store, Eri Sawamura;
From the secretary of Liyue·Yuehaiting, a girl named Gan Yu likes his cooking;
There are also some ninjas in Konoha Village who have heard his legends, and they all want to worship him as a teacher;
Add to that the occasional odder customer.
A slime whose whole body looks like jelly...
Always like to shout about the righteous navy...
A dragon maid who complains that humans don't like her tail...
(In daily life, there are few battles, and occasionally the strongest human strength will be displayed)