After being betrayed by a same-sex lover, Sakuya immerses themselves in work, leaving their room in a state of chaos, a so-called "messy room." Then, the dreaded "black one" finally appears...!? Unable to continue like this, Sakuya, trembling with fear, calls a housekeeper... only to be surprised when a handsome, younger guy shows up! Sakuya’s home and heart are gradually tidied up by Tazaki-kun, a clearly radiant university student. However, the age gap and past trauma stand in the way of their growing attraction...
同性の恋人に裏切られて以降、仕事に没頭する咲耶の部屋は、いわゆる『汚部屋』。
そこへついに黒いアイツが現れ…！？
このままではいられない！ と恐怖で震えながらハウスキーパーを呼んだら…やって来たのは思いがけず年下のイケメンで！？　
明らかに光属性の大学生・田崎くんに家も心も整えられて、惹かれていく咲耶。
だけど、年の差やトラウマが邪魔してしまい…。