A Four Story Apartment summary: Aki, who has lived life in easy mode. When he went on a trip to Finland where he rented an apartment, he met Mika, a handsome man from Northern Europe, and got drunk and H... lost his virginity!! He thought they would never see each other again, but Mika ended up staying at Aki's share house "Apartment Four-Story"?! While he was sleeping, he was bullied, pressured, and talked about as a lover. In addition, the residents of the share house, Kujou (Aki's friends) and Mosao (the plain bullied child), are also involved?! Included one-shot: Madamada, Gosan