S1·E24 Dance with the Mantis

Karin is having a costume party and invited everyone, from Ikki, Erika, and Metabee (who are real glad to be invited) to Samantha and the rest of the Screws (who were surprised to get an invite). Koji got and invite to and he decides to confess his love to Karin at her party. Just as he's about to confess his love, the rubber Robo Gang crashes the party and with all the confusion, Koji confesses his love to Samatha, by accident. But she thinks he's really telling the truth.