宮田 康司

He is a middle-aged teacher at the school which his son Kouichi and Yuuna attend.
He has a rational and calm personality. He normally strives to be a good father and teacher.
He appears young with an air of freshness, and is very popular for not having a strict attitude at school.
He is an excellent teacher and serves as a homeroom teacher and also as the person in charge of the science curriculum.
His wife passed away about 20 years ago, and it's been only him and Kouichi living together ever since.
He treats the Akidzuki household as family and cherishes and considers Yuuna as his real daughter.
He spent his days productively as a father and a teacher,
but Yuuna and Kouichi's relationship sparked the relation of his own perverted true feelings.