Koji has a huge crush on Karin and decides that Rosewood School's Annual Costume Party is the perfect time to tell her. Meanwhile, Ikki is Robattling Brass for practice when Karin arrives and invites her friends to the party. Samantha, Spyke, and Sloan overhear Karin and are determined to sneak into the party. Ikki and Erika confront Koji's Steward who explains the origin of Koji's phobia. It seems that when Koji was young, he would collect bugs and one day brought home a praying mantis nest. The nest was forgotten until one day when the insects hatched and attacked Koji.