This time Takeru walks in on Haruko. To mollify her, he asks for an explanation of the kenkeibu, which turns out to be Haruko's part of the student-run madō kenkei kikō (魔導検警機構, "Anti-Evil Organization"), or maken-ki for short. After learning that its mission is to ensure the fairness of duels and to protect the duelers, Takeru commits to joining it, as do Kengo and Inaho, albeit each for reasons of their own. The new-member welcoming party is held at an onsen, but since it is co-ed, or kon'yoku (混浴, mixed-bathing), everyone wears a swimsuit (this does not stop Takeru and Kengo from ogling their cohorts). The intrusion of a bear provides the chance for everyone to show off their abilities and demonstrate the spirit of maken-ki.