Kazuto Okiura

Often seen with a cigarette and a persistent grin, this Yakuza-linked debt collector serves as a primary antagonist threatening the future of Sayaka’s kindergarten. As Sayaka’s former husband, his presence creates intense friction with Fujimoto, who harbors deep resentment over Okiura's past treatment of her. While he delights in provoking others and has developed a curious interest in Kobato, his cheerful demeanor masks a darker, more menacing nature that complicates his seemingly genuine concern for Sayaka.