Mahiro, a poor struggling student with no home and no job, sees a suspicious sign and applies for a part-time job as a caretaker for a tenant. He sees a suspicious notice and applies for a part-time job as a 'resident caretaker'. What awaits him is an immoral share house where orgies are a daily occurrence! Mahiro is perplexed by the hedonistic and over-the-top characters of the residents, but luckily, his roommate Kento is an unsociable but decent loner. He's gentle, but he seems to be protecting Mahiro, who is too defenceless and pure...?