Boy's Room

From MangaHelpers:

This manga contains four short stories about boys in love with girls.

In Boy's Room, Taku has conflicting feelings about his older sister's friend, Aoi.

In Je t'aime, Etsu's cooking skills may be insufficient to win the heart of the girl he likes.

In Vintage, Ken is a popular guy, but he may have missed his chance with the girl he likes.

In Baby Boys, Takasugi meets a girl who wants to be tough, but he sees her as a cute girl.