Miyama Manaka, a dedicated student at the prestigious Seiho Academy, has been navigating the complexities of her secret romantic involvement with Tonami-sensei. As their encounters become a regular part of her life, she finds her feelings deepening with every shared experience. One day, Tonami-sensei leads her to a private rented flat, revealing that two of his old friends are already there, eagerly anticipating their visit. This gathering marks a new chapter in Miyama's journey, filled with anticipation and unforeseen developments.