Akiko, a young Japanese student working as an escort, reluctantly visits Takashi, an elderly retired professor, at his apartment. Initially wary of him, she soon discovers his gentle demeanor and his curiosity about her life. Their interaction is interrupted by the constant calls from Akiko's controlling boyfriend, Noriaki, who is unaware of her double life. The next morning, Takashi offers to drive Akiko to the university for her exam, unravelling a series of misunderstandings when they encounter Noriaki, who mistakenly believes Takashi is her grandfather.

Deceit and tension build as Takashi pretends to be Akiko's protector and navigates the complexities of her life. His quiet presence offers Akiko a refreshing sense of security and understanding compared to the turmoil she faces with Noriaki. As the day progresses, secrets and identities clash, propelling them into situations that challenge their perceptions of trust and intimacy. All three are forced to confront their own vulnerabilities against the backdrop of Tokyo's bustling and indifferent landscape.