In a world where the hero has defeated the Demon King and peace has returned to humans and demons, Shidan, a demon living a carefree life as a wandering painter, suddenly finds himself targeted by the Royal Knights. The crime Shidan is accused of is teaching martial arts to the Demon King, who has rapidly gained power and is causing riots in various places. Although attacked by the knights on suspicion, he overwhelms them with his rusty sword, demonstrating his strength that even the knight commander is no match for. Shidan longs for a peaceful life as a painter, but is placed in a "Covenant Ring" by the hero, who is in disguise, and is semi-forced to accompany him on a journey to defeat the Demon King...!?

Yoshida Komugi is an energetic but clumsy middle-school student who performs as an idol. Although her popularity is lacking, Komugi lives a dual life between her two worlds, until a mysterious creature named Usa-P appears before Komugi and grants her the powers of a Legendary Girl. Now Komugi has reluctantly become Magical Nurse, and must add a third life of fighting monsters to her already crowded lifestyle.

From [MangaHelpers](https://www.mangaupdates.com/groups.html?id=1011): Nina Shirosaki is the daughter of a mafia family. She's determined to become a hitman, but she's so kind and gentle that she has trouble even killing an insect. Now she's on her way to Japan with her father, on mafia business. She begins to attend the local high school, hoping to build her way up to being a hitman by becoming the evil boss of the school. Unfortunately, she soon makes friends with the daughter of a police chief! Will Nina ever succeed in doing something mean, giving her hope for her chances of becoming a hitman? [tethysdust]