Irony Dress Ni Sayonara Manga

アイロニードレスにさよなら (Japanese); Goodbye to Irony Dress (English)

From Fujoshi Bitches: A shriek was heard as a sailor uniform skirt fluttered, and Meguru thought himself a lucky perv till he caught a glimpse of... a guy's boxer shorts? "Quit staring, old fart!" By chance, he ended up inviting the high school boy in girl's uniform, Keiichi, to his place with the mystery of why he wears that uniform still unsolved. Unwittingly, however, Meguru discovered the reason behind Keiichi's uniform... Two hearts entwined and a tale of first love, to reach out to get closer to your heart. "That uniform, are you wearing it 'cause you really want to?"