Fumiko no Kokuhaku is an independently produced short anime which you have to watch:

If I’m not mistaken, the author is Tete, and you can check more info at Fumiko no Kokuhaku official website.
Kinda reminded me of Toki wo Kakeru Shoujo (The Girl Who Lept Through Time)… probably because of the downhill antics. xD
For those who didn’t understand and are curious, goes more or less like this: She confesses liking the guy. He tells her he’s sorry but he has to dedicate himself to baseball. Then, by the end of the whole deal, she tells her she’s gonna make him misoshiro (traditional soy paste soup) everyday (which is something wannabe wives tells their pretended husbands in Japan – very classic), but he once again tells her he needs to focus on baseball.

Source: SankakuComplex (NSFW)