At 27, Himari Shibasaki and Kazumi Hojo have been inseparable since college, but a drunken confession about Himari’s romantic insecurities completely transforms the boundaries of their friendship. What begins as a physical arrangement born from mutual loneliness quickly evolves into more, as neither of them is sure if their romantic feelings are reciprocated. Kazumi, haunted by a traumatic childhood, has secretly loved Himari, who he believes saved him from his own hollowness. Meanwhile, Himari struggles to drop the "perfect girl" persona she uses to mask her own past grief. As they navigate the transition from friends-with-benefits to a committed couple, their fragile peace is threatened by a jealous coworker and a dangerous stalker from Himari’s past, leading to a potentially dangerous situation.