Kazune Hanyama, the protagonist, attended a kendo match one year ago where his older brother, Hibiki Hanyama, was competing. There, he was introduced to two of his brother's kendo club friends—one of whom was the unforgettable Senpai Katsuki. Kazune developed deep feelings for him and, after enrolling in the same school, joined the kendo club hoping to see him again. However, his brother and the two seniors, including Katsuki, graduated and left the club. Unable to forget his senpai, Kazune spends his days obsessively looking at photos and masturbating. One day, his brother Hibiki tells him he'll be bringing some alumni to observe practice—and to Kazune's shock, Katsuki appears. While receiving instruction, Kazune accidentally injures his finger. In that vulnerable moment, Katsuki suddenly licks his finger, making Kazune's heart race. Then, with a firm "Come here," he's pulled into the back room and forced into a blowjob. Kazune climaxes with a facial on Katsuki's face, then leaves the clubroom in emotional turmoil, returning to the classroom. As he prepares to go home, his junior, Naoki Okumura, enters, pins him against the wall, and confesses, "I love Senpai!" before kissing him passionately. Overwhelmed by Naoki's intensity, Kazune gives in and surrenders his body.