Shin Koihime Musou: Live Revolution

The single-episode OVA Shin Koihime Musou Live Revolution was created by studio Dogakobo as a spin-off project from the original series, in which that Kan'u, Chouhi, Ryuubi and other characters sing the theme songs from Koihime Musou and Shin Koihime Musou on the stage. (based on AniDB synopsis)

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Producers, official website and other details: AniDB, Wiki. Search on: ANN.