飛鳥 四郎

Asuka Shirou is a young man who works at the same company as Ryuu. He met Ryu because his sister was friends with Fubuki, and he asked her to do some debugging work for him. This led to him learning about Ryu's older brother, and he decided to hire him. As Ryu has no friends; Asuka is the only person he can get along with relatively well. [Translated from the official site, archived]