桜庭 善一

The protagonist of the game who lives together with his little sister, Minaho. Their parents left overseas to go teach different kinds of people, as they are teachers. He often leaves the making of the breakfast for his childhood friend, Hami. He is often called an old man due to his tastes: he enjoys tinkering with bonsai trees, and his favorite food is rice crackers. He is good at history while he hates and is bad at english.

Under a request, Zenichi was chosen to be the lone member of the "Lovely Smile Committee" to differentiate between "pure" and "impure" love. However, he soon manages to pull in Hami, Aino, Minaho, Iroha and Ayaka to assist him with the committee work.