Umi and Kazao are finally dating. Umi spends days deepening her love with Kazao, who is overseas, through video calls, and feels lonely that he can't get in touch with her.
When she discusses the situation with her best friend Makoto, she hears from Yuka that she saw Kazao walking with a woman in the downtown area.
A psychological drama about unhealthy interpersonal relationships explained often through elaborate flashbacks. Takanako Mayuko, who grew up in an idyllic mansion with the perfect loving family, blames her childhood best friend for everything that has gone wrong in her life. While maintaining the façade of friendship, Mayuko finalizes the revenge she’s been secretly plotting for decades.