Yuma, a high school second-year, is enjoying every day now that she has her first boyfriend. After she asks for relationship advice from Hotaru, her beautiful long-time friend who has had many boyfriends, Hotaru teases her for her inexperience and playfully does things to her that even her boyfriend doesn't do. Yuma and Hotaru's secret relationship continues to escalate, and Yuma finds herself unable to deny how it makes her feel. This school drama tells the story of the interwoven lives of these two girls with boyfriends.
Yuma is more confused about her feelings than ever. Hotaru talks to Takeda to cover for Yuma.
Yuma and Hotaru have started fooling around again. Hotaru reflects on the deal she and Fujiwara made.
After Yuma and Takeda have a heart-to-heart talk, Yuma starts to accept her true feelings for Hotaru. But how will Hotaru respond?
Against her better judgment, Yuma gets a job at Hotaru's workplace. But with cram school and her relationship problems to deal with too, can she keep it up?
Yuma and Takeda take some time off, and Fujiwara reveals that he knows about Yuma and Hotaru's "practice."
Yuma finds out about Hotaru's part-time job, and she's less than thrilled about it.
Both couples go on an unsupervised snowboarding trip. What will their sleeping arrangements be?
Yuma is uncomfortable when her boyfriend Takeda asks her to stay the night and Hotaru continues to escalate their "practice."
Yuma confronts Fujiwara over Hotaru's black eye and the rumors.
High school girl Yuma finds herself going further with her long-time friend Hotaru than she does with her boyfriend when Hotaru offers to help her "practice" for her relationship.
Yuma confronts Hotaru over her relationship with Fujiwara. Can she convince Hotaru to leave her abusive relationship?
Things get awkward when the girls room with the guys on the second night of the snowboarding trip, and Yuma hears an unsettling rumor.