The film stars Yūichi Nakamura as Jun Shibahara, Yūta Takahashi as Naoki Murai and Shō Kubo as Shōichi Kato.

[1] The movie also has a sister film premiered simultaneously titled Classmates, which is composed of the same cast but with different plot and without BL themes.

Jun also must deal with constant rumors that his father got his late mother pregnant (who was one of his students) and never married her, another reason why he is nicknamed like that.

During his visits to the hospital he meets Nozomi Hayakawa, a classmate who has been admitted due to a cancer and learns that she has not much time left.

Shortly after, his replacement in the swimming team, a boy named Naoki Murai, asks Jun to be his coach since he sees him as his idol.