Battle for Legitimacy

Battle for Legitimacy is the twelfth and final episode of the first season the How NOT to Summon a Demon Lord series. It aired on September 20, 2018.

Synopsis
''At the sight of Rem being gravely wounded, Klem becomes enraged and fully awakens into the demon lord Krebskrum. It falls to Diablo to contain Krebskrum's rage before she destroys the whole city.''

Differences from the Light Novel

 * There is no battle with Kuzukage.
 * The anime has a "harem ending" that did not occur in the light novel.