A new semester begins, and the spring breeze carries cherry blossoms through the school. On this day of excitement and anxiety, Segawa's classroom is overflowing with heat and energy. Groups have already formed inside the classroom, and the air is filled with the sounds of happy conversations. As for Segawa, he almost overslept on the first day but managed to reach the classroom just as the bell was about to ring. After taking his seat, Segawa hangs his bag on the side of his desk and yawns while waiting for the bell to signal the teacher's arrival. A boy sitting in the seat in front turns around as if to talk to Segawa, but the bell rings, and he immediately turns back to the front. The classroom falls silent within seconds. The door at the front of the room opens, and as the new homeroom teacher enters, the classmates become a bit restless. The new teacher stands at the podium and begins his self-introduction.

"Nice to meet you all. I'm Akihito Sawada, and I'll be your homeroom teacher for the year. Feel free to call me Akihito-sensei~" As Akihito smiles, the classroom is filled with the sound of applause. When the clapping stops, Akihito begins to speak again. "Also, we have a transfer student joining this class today! Everyone, please be welcoming. You can come in now." The door slides open with a rattle. When 'he' walks in, Segawa is struck by a shock that feels like a physical blow to his chest.