Gender: Female Blood Type: AB Age: Late twenties Height: 152cm Weight: 40kg Normal body temperature: Low Constitution: Cannot get drunk Waking up: Poor Fuel efficiency: As bad as a classic muscle car First person: I (rough, masculine) Clothing: Officer's uniform Living situation: Nerima Reconnaissance Unit underground hideout Addressing others: Mujin Mudano → Mudano, Kyoya Oiranzaka → Kyoya, Kaoru Namikido → Kaoru She was in the same year at Rasetsu Academy as Mujin Mudano and Kyoya Oiranzaka. Senior to Kaoru Namikido and Shion Kuchimori. Having lived as a man for a long time, she has almost no sense of shame or danger regarding her gender. She views her appearance merely as a convenient tool for infiltration and disguise. Since she wore the male uniform during her academy days, Mudano and Kyoya initially thought she was just a small boy who hadn't hit puberty yet. Around their second year, they checked because her height and weight weren't increasing at all, and she bluntly stated, "I'm a woman," leaving them both wide-eyed. While the corners of her mouth are turned up, her eyes—with wide-open pupils—are not smiling. Her facial muscles are essentially dead. She usually maintains a poker face, but it's obvious when she snaps. A baby-faced beauty with short black hair and a slender build. Captain of the Oni Institution's Nerima Reconnaissance Unit. She immediately hides any illness or injury. The worse it is, the harder she tries to conceal it, like a stray cat. She finds the overprotectiveness of those around her annoying, but miraculously, she has rare moments of showing a softer side. Secretly, she finds Kaoru to be the most troublesome to deal with.

Blood Type: A Age: Late twenties Height: 183cm Weight: 72kg Alcohol tolerance: Very high Waking up: Good First person: I (rough, casual) Clothing: Black dress shirt with black slacks. Red tie. Addressing others: Masumi Yodogawa → Masumi, Kyoya Oiranzaka → Kyoya, Kaoru Namikido → Kaoru, Shion Kuchimori → Shion Peer to Kyoya and Masumi. Senior to Kaoru and Shion. A member of the Oni Institution and a teacher at Rasetsu Academy. The man who once left 100 Momotaro in a sea of blood. A rationalist who hates waste, he wears roller skates for faster travel, yet he is a tall, handsome man with black hair. Lean and muscular. His facial muscles are mostly immobile. In truth, he is kind and surprisingly caring toward his students. He harbors extremely heavy feelings for Masumi. Though he doesn't show it on his face, he is deeply worried about her reckless behavior. He is skilled at forcing her to rest through sheer power. He gets grumpy if he isn't the first to notice something is wrong with her. When he saw Masumi with one leg blown off, he nearly destroyed the world in a rage.

Blood Type: O Age: Late twenties Height: 184cm Alcohol tolerance: Average Likes: Sake, shochu, accessories First person: Switches between I (rough) and I (soft). Uses the rougher one more often. Clothing: Red high-neck jersey with white ribbing on the neck and hem. Black bottoms. Always wears a white lab coat over it with the sleeves rolled up. Wears earrings, bracelets, and rings. Addressing others: Masumi Yodogawa → Massu, Mujin Mudano → Dano-chi, Kaoru Namikido → Kaoru-kun, Shion Kuchimori → Shion Peer to Mudano and Masumi. Senior to Kaoru and Shion. General Captain of the Medical Unit at the Oni Institution's Kyoto Branch. Currently assigned to Rasetsu Academy. His blood is special; by having others drink it, he can multiply an Oni's recovery rate and heal injuries. It works on himself too. He once regenerated one of Masumi's legs. The recipient experiences pain equivalent to the severity of the injury as it heals. He looks and talks like a playboy, but he is a reliable presence. A pink-haired handsome man who claims to be surprisingly devoted. Lean and muscular. Both as a medical officer and as a friend, he cannot overlook Masumi's recklessness. He also functions as the stopper for Mudano's rampages. When he saw Masumi missing a leg, he cracked a joke instinctively but was actually quite shaken.

Birthday: December 2nd Age: Mid-twenties Height: 175cm Weight: Unknown Alcohol tolerance: Average First person: I (soft, polite) Clothing: Officer's uniform Addressing others: Masumi Yodogawa → Captain Masumi, Mujin Mudano → Mr. Mudano, Kyoya Oiranzaka → Mr. Oiranzaka, Shion Kuchimori → Shion Junior to Mudano, Kyoya, and Masumi. Peer to Shion. Vice-Captain of the Oni Institution's Nerima Reconnaissance Unit. A handsome man with black hair and sanpaku eyes. He has a gentle smile and a mild way of speaking. He speaks casually to Shion Kuchimori, but his words to him are harsh. Lean and muscular. He respects Masumi and admires Mudano. He is tireless in managing Masumi's health, noticing even the slightest change. Normally, Masumi's word is law to him, but because she is so reckless, he occasionally snaps. When angered regarding Masumi, he becomes the most troublesome person even for her to handle, as he interrogates her with a pleasant smile and soft tone. When he saw Masumi missing a leg, he responded calmly as Vice-Captain, but his hands were actually trembling.

Height: 177cm Age: Mid-twenties Alcohol tolerance: Likes to drink First person: I (rough, casual) Clothing: Officer's uniform Addressing others: Masumi Yodogawa → Masumi-senpai, Mujin Mudano → Mudano-senpai, Kyoya Oiranzaka → Oiranzaka-senpai, Kaoru Namikido → Kaoru Junior to Mudano, Kyoya, and Masumi. Peer to Kaoru. Captain of the Oni Institution's Suginami Combat Unit. A man who hits on women as naturally as he breathes. His preference in women is as vast as the universe. A handsome man with purplish hair. Characterized by the chew stick in his mouth and light-tinted sunglasses. He uses a relaxed, polite register with seniors. Though he appears flighty, he was once a teacher at Rasetsu Academy and was called a saint. His current personality formed as a result of the trauma of seeing students and young soldiers die. His core hasn't changed; he still looks sad when a young enemy Momotaro dies while throwing their life away. Because he has borrowed money from Kaoru and hasn't paid it back, Kaoru is very harsh with him. While he is slower than the other three to notice Masumi's condition, he is the fastest to grasp the situation. Even though Masumi isn't a minor and is actually his senior, he can't leave her alone because she's so reckless.