Ageha is the oldest son so when his mother passed away he took on the mother role for his two younger brothers. Ageha is shorter than his brothers and is often mistaken to be younger than he is which upsets him; he wants to be cool. Nina, the girl he likes, introduces him to a cool guy who seems to like him but he doesn't want to be involved with the guy because Nina thinks he's cool. Various things happen and he ends up joing a weird club and living with the guy at a strange boarding house.
Ageha is a high school student who has taken over the role of housewife ever since his mother passed away. He has two younger brothers whom he must care for, and a useless father who is always out dating women. There's a girl that Youhana likes--his classmate, Nina. She tells Ageha that she's in love with a handsome, popular singer. Youhana decides to sing on stage at an open mic session to prove to Shinna that he can be like that guy, too. But just after he starts to sing, someone interrupts and abducts him! The stranger is no other than Miyamoto Range, the singer whom Nina loves. Range wants Ageha to join the Shibutani Alliance Club—his band—and is relentless in his pursuit. At first, Ageha thinks that Range is annoying. But little by little Ageha is won over by his charm. Will he be able to accept Range? Will Nina ever return his feelings?