TV-Series
Description
Daichi Kitaumekawa is a mathematics teacher at Makisuhara High School, known for his attractive looks and an outwardly kind, supportive demeanor. This cultivated image makes him popular, especially with female students, as he often engages in private conversations about personal issues. However, he carefully conceals the fact that he is married.

Privately, Daichi possesses a perverted and manipulative nature. Married to Shizuka and father to Minori, he expresses dissatisfaction with his family life, stating one woman is insufficient. He actively seeks a harem, targeting his students, including Satō Matsuzaka. His obsession with Satō started at a school entrance ceremony and grew after a school event, leading him to stalk her commute between work and home.

This fixation culminates when Daichi corners Satō in an alley, confessing his lust and attempting to assault her. Satō triggers a safety alarm, forcing Daichi to flee when residents respond. The next day, Satō confronts him at his home. Enraged by his admission of targeting students, she overpowers him and repeatedly stomps on his crotch. This attack inadvertently reveals his masochism, as he finds pleasure in the pain. Satō exploits this by threatening to expose his infidelities and perversions to his family, coercing him into becoming her accomplice.

Under duress, Daichi obeys Satō's order to dispose of three suspicious bags, burning their contents without looking inside. He later speculates the bags might have contained human remains and feels aroused by the smell of the burning material. Subsequently, he grows suspicious that Satō murdered her aunt, citing returned mail as evidence. In retaliation, he reports his suspicions to the police, relishing the prospect of her downfall. This plan fails when Satō's aunt is revealed to be alive, indicating the bags contained another victim.

Daichi's storyline concludes with his arrest. In the anime, authorities detain him during the final episode's credits for unspecified reasons, implying his family discovered his infidelities. The manga specifies his arrest results from his role as an accomplice to arson, linked to the apartment fire orchestrated by Satō's aunt.