On his first day of high school, the 15-year-old Kenmoto Kazuki rushes to school only to encounter a mysterious figure on a wall who urges him to avoid the main entrance. In a moment of impulse, Kazuki unexpectedly blurts out, 'Please marry me!' The shocking revelation follows as the figure, none other than his homeroom teacher Morikeoke Akitou, tumbles from the wall, leaving Kazuki stunned by his unintentional proposal to a man. Thus begins a unique and unexpected journey of relationships and self-discovery. This tale is encapsulated in the one-shot included in Volume 1: Karada no Yuuutsu.