The introverted 16-year-old, Nao Mizuhashi, is shy and prefers spending his leisure hours playing games in the restroom in peace, avoiding social interactions. One day, his solitary routine comes to a halt when he encounters a senior student, Serika, in the boys' restroom. Serika, who enters the restroom, is unexpectedly hit by a severe nosebleed, drenching herself in blood. Nao finds this perplexing, as he's taken aback by the girl's presence in the male restroom and the sudden invitation to a date. Suddenly, Nao's world turns topsy-turvy.
