Height: 174cm

Weight: 64kg

Date of birth: May 27th, 1999

A glasses-wearing classmate with short bluish hair who is part of Junichi's group of perverted friends. He, Junichi, and Yui were classmates before in middle school. He is the one who usually initiates the plans and recommendations for Junichi, including planning the confession, giving movie tickets to Junichi, and others. He is also the first to make the connection between Yui and online idol named BoA. Shinpei has an older cousin named Sayaka, who attends university and is involved in a manga club.