Окіура Кадзуто

A debt collector who appears at the end of the fifth chapter in the manga, a man who has some association with Yakuza. He is noted in the series for smiling a lot and smoking. Okiura appears to be responsible for the constant impending closure of Sayaka's kindergarten and is also Sayaka's ex-husband. He seems to enjoy pestering and aggravating Fujimoto, the latter whom despises him for hurting Sayaka in the past. He seems to have developed an interest in Kobato following his first meeting with her. Despite his cheerful and collected nature, he has shown hints of a slightly more sinister side, possibly due to his Yakuza background.

Okiura seems to show what may or may not be some genuine concern for Sayaka, despite his continuous threats to close down the school.