Hachiya Torakichi

The local supermarket shop owner. He lives in the apartment complex Atsuko and Yui live in with their father. He's a pervert that touches Atsuko's butt the first time he meets her. Yui gets angry at him and demands that he leave her sister alone.

Spoiler

He has sex with Tomoe his biological daughter. He helps the mayor with the "volunteer" service which is actually a sex slave ring.