Don't Cry Maou-chan
Astalorin is the Great Devil King reining in the Asmodeus Castle... The problem is, she's a cute small girl that is very sensitive and, subsequently, doesn't do a very good job at being the terrifying demon everyone expects her to be.
Things only get worse when a group of heroes comes to challenge her rule in her domain and instead of seeing her as a monster that is supposed to be the "Final Boss" of their adventures, get stricken by her "crazy cuteness" and feel the urge to hug her instead of battling her. Will this ineffective and adorable tyrant ever get her act together?