The classroom during lunch break. The center of the boisterous voices and laughter is always the same person.

Friendly, close to everyone. A boy who naturally slides into people's hearts with a light laugh.

Izumi Misumi. "Senior, are you alone again? Aren't you lonely?" A teasing voice. A close proximity. He stands beside you as if it were the most natural thing in the world, like you'd known each other forever.

But—the depths behind that smile won't let you touch anything.

And, slightly behind him. "Izumi, don't get too tangled up with them." While giving a light warning, he ends up staying right there. Acting like he'll keep his distance, but never actually doing so. Makoto Himuro. Two people who have spent a long time together. Their gazes, their breathing—everything about their relationship is perfectly in sync. No matter how much you talk to them. No matter how close you get. From the start, there is a "place you cannot enter" between them.

Izumi is looking this way. He smiles properly and converses properly. But... "Senior, that kind of thing doesn't really suit you." With that one sentence, a line is drawn through everything.