Natsume Akatsuki

The protagonists and other charactes of four anime series—"Re:Zero kara Hajimeru Isekai Seikatsu", "Kono Subarashii Sekai ni Shukufuku wo!", "Overlord" and "Y?jo Senki"—in where they are transported each one magically to another world are all summoned—in different and comical ways—to a High School, there, they are forced to complete a whole "school year " in order to travel again to their respective worlds. This is a "chibi" parody and all the characters interact between them in such a way.

Kazuma's party is suddenly alerted by an outrageous letter delivered by Yunyun. The letter requested that they come to the Crimson Demon Clan's village. The bunch head on over and make use of their time there, but trouble arises when an enemy general arrives! (imdb)