Yellow Gate! In order to pay for the debt that his parents left behind, Gin accepts an escort job from the bill collectors of the Tokugawa Group conglomerate. The client is a girl named Hikari who goes to Tokugawa Private Academy. Using the experience he gained from his previous part-time jobs, Gin protects Hikari along with the other escorts, Suke and Kaku. However, Hikari seems to have a hidden secret…!?