Takumi Iguchi, a 25-year-old teacher assigned as homeroom instructor for PK Academy’s class 2-3, faces immediate distrust upon his arrival due to his sharp, slanting eyes and perpetually wide grin, which students and staff interpret as a "perverted" demeanor. Even the principal openly doubts his integrity during his first day. Yet beneath this misleading exterior lies a disciplined educator who commands respect, effortlessly managing disruptive students like Riki Nendou and Metori Saiko through calm authority. His default stoic expression, contrasting his occasional smiles, deepens initial wariness, though students slowly uncover his earnest dedication and underlying kindness. Prone to misjudging scenarios, he mistakes Riki’s odd behavior for bullying and assumes poorly styled haircuts stem from peer cruelty, revealing his hypervigilance toward student welfare. Prior to PK Academy, he taught at another school, and his personal life balances routine jogging, photography, and relaxing hot spring visits. Ironically, the kanji in his surname rearranged spells "pervert," mirroring the misconceptions he battles daily. Though no overt arcs document his growth, subtle shifts emerge as students transition from suspicion to recognizing his sincerity. He actively mediates conflicts, intervening in unspecified bullying incidents, his presence underscoring a quiet commitment to fostering a respectful classroom despite persistent misunderstandings.