Hayashi Shoutaro is an otaku and a student who is bad at studying, with poor results on every test; to make matters worse, he makes bets like the one who scores the lowest has to clean the classroom alone. In his classroom there is a girl he likes, Kanda Yayoi, who always scores the highest and is popular among boys and girls. After returning home from cleaning the classroom, he is met by his perverted/otaku sister, who has him cross-play (cross-dressing cosplay) to attend an anime merchandise display, where he meets Yayoi, who is also an otaku, and she falls in love with his cosplay persona...?