Hajime Kamoshida

Finally, the day of Mai's high school graduation has arrived. While Sakuta eagerly waits for his girlfriend, an elementary schooler who looks exactly like her appears before him. Suspicious, and for all the wrong reasons... Meanwhile, Sakuta and Kaede's father suddenly calls, saying that their mother wants to see her daughter. She was hospitalized because Kaede's condition had been too much for her to bear, so what could she possibly want now?

高校二年生の梓川咲太（声：石川界人）は、空と海が輝く街・藤沢に暮らし、先輩であり恋人でもある桜島麻衣（声：瀬戸麻沙美）と心躍るような日々を過ごしている。しかしそんな日常が初恋の相手・牧ノ原翔子（声：水瀬いのり）の出現により一変。何故か中学生の翔子と大人の翔子との二人が存在しており、咲太はやむなく翔子と一緒に住むことになるが、大人翔子に翻弄され麻衣との関係がぎくしゃくしだす。そんな中、中学生翔子が重い病気にかかっていることが判明。咲太の傷跡が疼きはじめる。

After a draining December, Sakuta is quickly nearing the end of his second year of high school. Since Mai is a third-year student, they don't have much time left together before graduation rolls around. Meanwhile, his sister, Kaede, is slowly but steadily venturing outdoors again. Just as she begins to find her footing, she announces her most ambitious goal yet—attending her brother's high school! Sakuta knows better than anyone how difficult this will be for Kaede, and he's ready to support her however he can. He's just not sure if that's what's best for her...or what she really wants...