Iwaizumi Hajime and Toru Iwaizumi have been married for a while. They had a set of twins Yoichi and Sachihiro who are 16 years old

Yoichi looks like Toru but has Hajimes personality. His more close to Toru Sachihiro looks like Hajime but has Torus personality. His more close to Hajime.

They both call Toru mom even though his male so because they always saw Toru as the mom and Hajime as the dad for some reason. Toru tried getting his kids out of this habit but failed.