Kawase Hitoshi is the younger brother of main protagonist Kawase Mitsuro and a university student. He exhibits distinct jealousy toward Kazama Toshiaki, the other main teacher romantically involved with Mitsuro. This jealousy introduces complications into the central romance between Mitsuro and Toshiaki. Hitoshi's actions and emotional resistance contribute significantly to the interpersonal tensions within the narrative. His role originates from his familial bond with Mitsuro and his opposition to the relationship developing between Mitsuro and Toshiaki. The character's established dynamic remains consistent, without significant development or expanded background across the official media, and no additional narrative arcs or spin-offs are documented.