Sakuya Ohtori

As a third-year student at the same academy as Kotarou, this approachable senior serves as a protective, guardian-like figure for Chihaya. Although they share a surname, no biological connection exists between them. While he maintains a friendly and social demeanor with most peers, he reveals a much frostier side specifically toward Kotarou, often taking great delight in teasing and mocking him whenever the opportunity arises.