Imaizumi is a high school boy who lives alone in his apartment for a reason. He has a secret that he can't tell to anyone. And the secret is that he lives with the top three Gyarus (gals) of his school, Hamasaki, Kurumozaka, and Sasaki. He spends his day playing, talking and getting physical with these Gyarus, all of whom have a quirk or two. Imaizumi-kun is getting more and more addicted to his lazy, naughty and free "youth"...?"