Shirai is a friend of Keitaro Urashima. He is seen with his "partner in crime", Haitani.
Kimiaki Shirai is one of Keitaro's friends. He loves to make fun of Keitaro Urashima, calling him a failure in girls and academics, but pulls back later on when Keitaro becomes more successful. He almost always appears with Masayuki Haitani , his "Partner in Crime". His main interests are in women, and one of his only upside is some degree of skill in computers. He also seems to have an interest in an older woman like Haruka Urashima, who he flirts with from time to time.
He is short, and is almost always shown with big round glasses. In the manga's fifth volume, Kaolla Su even calls him a "small, fat, Hobbit".
In the anime television series, Shirai is voiced by Michio Miyashita in Japanese and Gene Holliday in English.