Ep. 10: There's a Subtle High Deflation in the World. Play Games without Accumulation

This episode, which is anime-only, takes place during the same time as episode 8 and shows some other strange things that were going on in the background. A female demon, Abe Maou, living inside an old video game is awoken and takes the Hakuou Three Amiga; Miki, Izumi, and Risa of the student council from Nagi's school inside the game where they must defeat her to return to the real world. Hinagiku, the student council president, arrives soon after and they go to destroy the demon, but she ends up ending it herself. (Source: Wikipedia)

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