Keita Imaizumi is a awkward yet kind 18 year old high school student who lives alone because his parents kicked him out for being too wimpy. He has a secret that he cannot tell anyone: he lives with three of the top caste gals in his school, Reina Hamasaki, Ruri Kurumizaka, and Yukina Sasaki. He spends his days playing, talking, and getting physical with these gals, all of whom have one or two quirks. As time goes on, Imaizumi becomes more and more addicted to the lazy, naughty, and free "youth"...?