Hello! I've been wondering about this for a while.

As part of the anime Kämpfer für die Liebe, there's a cover of "Ode to Joy" that as far as I can tell was never released on any OST.

The only clip on Youtube (here) skips a bit of it, but if you find an actual copy of the series, it's episode 1, starting at roughly 17:03.

It seems to be sung by the series' "Messengers" aka "Entrails Animals", who are voiced by multiple people, including Nana Mizuki, Yukari Tamura, Michiko Nomura, Mamiko Noto, and others.

I've been wanting to find a full version of the song without everything overlayed on top (which is obvious that it exists, as you hear all 3:04 of it in the show itself).

Thanks for any help you may have!