Combatants Will Be Dispatched!, Vol. 10 (manga)

Despite all her tantrums and failures, Lilith has proven her strength as a Supreme Leader with an overwhelming victory against the Demon Army. Now, Kisaragi Corporation is one step closer to planetary domination! When Six and the others receive an invitation from the Demon Lord, they set offff at long last to confront the leader of their local competition... and hopefully uncover the amnesiac Rose's origins along the way.