Hisame (Ito Kentaro), a graduate student working at a cafe, is attracted to an older regular customer, Ima (Kuriyama Chiaki). One day, she asks, "I'm going to eat Mont Blanc...what about you, Hisame?", but Hisame brushes it off thinking it's just polite talk. In the end, Ima has a part-time job at the time she said she would go to the cake shop, but that night, Hisame, who is curious about her, passes by the cake shop and sees Ima there. Hisame apologizes for breaking their promise, and Ima replies that even the time she spent waiting for him, thinking about him, was fun. When Hisame tries to take a step forward in their relationship, Ima tells him, "There's something I want to talk to you about before that," and invites Hisame to her house. There, Hisame sees the two men. The bewildered Hisame is shocked to learn that they are both lovers..

Although Hisame (Ito Kentaro) is confused by the fact that Ima (Kuriyama Chiaki) tells him that she has another lover, he decides to start living with Ima and her two lovers, Ao (Senga Kento) and Itaru (Maruyama Tomomi). However, Hisame finds men's boxer shorts in Ima's room and is confronted with the harsh reality that she has a partner other than him. He confides his worries to Ao and Itaru, wondering if Ima's love and his love are not balanced. Ao tells Hisame that "love comes in many forms," ​​but his heart remains complicated. Meanwhile, Ima reunites with her high school classmate, Kinuka (Tokunaga Eri), and another story begins to unfold.

Hisame (Ito Kentaro) is confused by the way Ima (Kuriyama Chiaki) expresses her love, but struggles to accept it. One day, when Hisame is not at home, his mother Suzuko (Kurosawa Asuka) suddenly visits Ima's house. Suzuko is shocked and criticizes Ima for living with three lovers. Furthermore, when she finds out that Ima has a daughter, she berates him, saying, "It's a shame for a child to grow up in such an environment." Meanwhile, when Ao (Senga Kento) tells Hisame that "there is a ranking of love," Hisame is consumed with doubt, wondering "What rank am I in Ima's eyes?" and makes a secret plan from Ima, but..