The Demon King is Way Too Overprotective! manga volume 2 features story and art by Miko Senri.

Ordinary high school girl Seina is finding out firsthand that living with a powerful (and lovesick) demon lord has its perks. Damon, as she calls him, can use his myriad abilities-hypnosis, teleportation, summoning a cuddly cluster of cats-to get her out of any jam. Well, almost any. Seina's handsome friend Shion is a problem the demon lord can't seem to solve. All Damon knows is that he doesn't like their relationship one bit, but fate has other ideas in mind... and an upcoming school trip promises a whole lot more complication!