Asagi Mutsuki is the "Chief of Staff" and assault activist of Problem Solver 68, a self-proclaimed mercenary group of students, and a second-year high school student at Gehenna Academy. She's a devilish troublemaker who enjoys causing mayhem. Mutsuki is a mischievous prankster at heart, always committing misdeeds without hesitation, often involving dangerous weapons. She likes to play dumb, but is more clever than she lets on, being able to read other people's feelings very easily. Her hobby is going to the black market and collecting bombs of all kinds. When being playful, she likes to end her sentences with "kufufu". Mutsuki often comes by to play with Sensei and is very impatient if she doesn't get attention, no matter if Sensei is busy. Because of this, she loves to tease and prank Sensei by taking advantage of her cuteness, and doesn't care how much it makes them embarrassed or uncomfortable, to the point of being manipulative. Mutsuki is a very short and petite girl, with purple eyes and silver hair tied in a long side ponytail with a black flower scrunchie. She has pointed ears. Mutsuki wears a short red skirt with ruffles, a black tank blazer with gold buttons, and a white ruffled turtleneck shirt underneath. She also wears a red ribbon around her neck, black combat boots, and a black thigh strap around her left leg. Her halo is a red set of two spiked circles with petals. Mutsuki always carries her "Trick or Trick" weapon, a brown H&K MG5 machine gun with a black grip and a brass carrying handle and fire selector. She says her gun is an important part of her fun pranks. Mutsuki also carries a large and heavy black duffel bag, apparently filled with explosives and other items (but she won't say), with the words "Love & Violence" written on the side. Mutsuki's bio on Momochat reads "I'm bored!" Her birthday is July 29th. Her height is 144 cm. She is 16 years old.