Read manga: Kimi No Koto Tabeteii?

manga
Summary:

I eat the same things at the same time. Your protagonist Omi Sorasaki is a high school student who's a devotee to the ordinary. But one day, a mysterious and beautiful girl transfers over and says to him "I have something to say to you alone after school." But what happens after is only just the first wave of an assault on all that is ordinary!