Takase Nanami (27 years old) is leading a seemingly normal life — until one night she returns home to find a mysterious younger man, Gaku, living in her apartment. He claims he has nowhere else to go and gradually insinuates himself into her life. What started as a convenient living situation soon reveals hidden depths: Gaku’s attractive face and unusual behavior hint at a past he’s hiding, while Nanami contends with work stress, stigma, and the bizarre truth of her “himo.” As they coexist under one roof, their relationship deepens in unpredictable ways, and Nanami wonders: is this dangerous freeloading roommate actually becoming something more…?