Is Kämpfer für die Liebe hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

Special · 2011 · 2 episodes · PG-13 - Teens 13 or older
Action, Comedy, Ecchi, Harem, Magical Sex Shift, Romance, School
A two-episode special. They are designated as Episodes 13 and 14, and the first episode is a direct sequel to the previous series while the second episode is about the trans-sex of Natsuru.
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