Tappei Nagatsuki

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.

Amanda Waller, director of A.R.G.U.S., sends a team of dangerous criminals Harley Quinn, Clayface, Deadshot, Peacemaker and King Shark on a mission to another world of magic and monsters. This "Suicide Squad" is tasked with assisting a kingdom in battling against not only mythical creatures but also other super-villains that were sent to the other world before them. If they fail to complete their mission in time or attempt to flee, bombs installed in their bodies will detonate. (wikipedia)