Seiko Horii

Kou's classmate who is a devout Christian. According to her, 95% of objects and daily activities are "the Devil" and she makes sure to let everyone know. In addition, she is never without her chastity medallion (not pictured).

St. Joseph's Holy Academy

 * Sachiko Kanemoto - Friend
 * Joy Ichijou - Friend

Etymology
Seiko means "holy child".

Horii is made up of two individual characters meaning "moat" and "well", as in a well of water.