Ep. 1: Natsuru Senō becomes a female Kämpfer and allies with Akane Mishima against Red Kämpfer.

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Natsuru Senō wakes up transformed into a woman after a stuffed tiger named Disemboweled Tiger explains he is now a Kämpfer. Because Kämpfer must be female, Natsuru assumes a female form. He is attacked by Akane Mishima, another Kämpfer, but saves her from a falling lamppost. The next day, the shy Akane reveals her true identity and explains that Kämpfer with blue bracelets are allies, while those with red bracelets are enemies. Natsuru and Akane become known as Blue Kämpfer. Kaede Sakura confesses romantic feelings for Natsuru’s Kämpfer form. Later, in the school library, they are ambushed by a hidden Kämpfer. Kaede appears amidst the wreckage, leading Akane to mistakenly shoot at her, assuming she is an enemy combatant.