Kanojo mo Kanojo

The protagonist, Naoya, is a first-year in high school. He asks out Saki, a girl he has been in love with, and she agrees to be his girlfriend. He's currently on cloud nine. But then, a beautiful girl named Nagisa comes up to Naoya one day and tells him that she wants to go out with him. Naoya feels himself wavering because Nagisa is such a good girl, and he comes to a decision! A new kind of romcom from a rather unexpected decision is about to begin!

(Source: Crunchyroll)