1. Destiny, the Chosen Ones

Natsuru Senō wakes up to discover one morning that he has transformed into a woman, upon which a stuffed animal tiger, Disemboweled Tiger, who introduces itself as a messenger, tells him that he has become a Kämpfer, which must do battle with other Kämpfer; since Kämpfer must be female, Natsuru transforms into a female version of himself.

2. Glow, the Fight of Death Starts

Natsuru stops Akane from shooting Kaede and the attacker escapes when the bell for class rings. Natsuru realizes that the enemy also goes to his school and becomes wary of the danger and cautious of the other girls around him.

3. Lily, the Secret Flower Garden

Natsuru begins his first day in the girls side of the school where he is transferred into Akane's class and is very popular among the girls. Kaede confesses her love to Natsuru, but he is unable to answer due to his bracelet flashing.

4. Declaration of War, the Fighting Maidens

As the cultural festival comes up, Natsuru is shocked to find that Shizuku has entered him into the Miss Seitetsu beauty contest.

6. Homecoming, are You My Friend or Enemy?

Natsuru is surprised to find his childhood friend Mikoto has returned. When Kämpfer Natsuru heads to school, she is forced to participate in a 'quasi-maid café'. She is later accompanied by Shizuku, who warns her that a new Kämpfer will be coming.

7. Invite, the Uninvited Guests

Natsuru, unexpectedly accompanied by Akane and Shizuku, arrives at Kaede's house, which has a lot of Entrails Animals. Kaede starts things off with a game involving two people biting through the ends of a Pocky stick.

8. Dearest, the First Date

Shizuku asks Male Natsuru to go out on a date with her. While Shizuku is generally insistent that it's a proper date, Natsuru just goes along with it thinking it is a plan to draw out the White Kämpfer.

9. Midsummer, Tropical Cyclone of Love

Akane is having a romantic summer date with male Natsuru at the pool. However, Mikoto, Shizuku and Kaede show up as well.

10. Fall, a Summer Experience

Natsuru finds himself sitting next to Kaede outside the hotel, who hypnotizes him into making Shizuku his.

11. To Choose, a Song of Happiness

Shizuku invites Natsuru over to her house to tell her about Kaede, getting Kaede's Burnt To Death Lion to spill the beans about the Kämpfer system.

12. Christmas, the Miracle of the Entrails Dolls

Natsuru wakes up on Christmas Eve morning to find out that he and his messenger, Disemboweled Tiger, have swapped bodies!