Nami Nojima is devoted to her blunt and teasing boyfriend, Kenji Owada, despite her friends' doubts about their compatibility. After Nami completes Kenji's homework to secure a date, the couple visits a hotel pool where a risky encounter behind a one-way mirror reveals a hidden, daring side of Nami, leading her to embrace the complexities of their relationship.
Nami discovers Kenji's infidelity and the crushing pressure he faces from his demanding father. Despite the betrayal and emotional turmoil, the two eventually reconcile as Kenji acknowledges his love for Nami and his desire to escape his family's expectations. Their relationship reaches a turning point at graduation, where they reaffirm their bond and commit to facing the future together.