When the son of a gangster, Ritsu Kasanoda, seeks Mori for tips on how to change his scary image and gain friends, the Host Club immediately jumps at the opportunity to change his image, making many humorous results of their efforts. The members of the Host Club also frequently call him Casanova and bossa nova. However, Ritsu ends up discovering Haruhi's secret.

After Ritsu walks in on Haruhi changing, he later joins the Host Club, but as a customer. When he insists on Haruhi as his host, the other hosts get nervous and the clients get excited. Tamaki starts to realize his feelings for Haruhi, and Ritsu nearly goes insane, while Haruhi remains blissfully oblivious.