Kaoru and Masumi

A collective of Oni created to combat the threat of extermination posed by the Momotaru Corporation. The organization gathers talented individuals capable of controlling their Oni instincts and abilities and trains them in three key areas: combat, reconnaissance, and medical care.

A unique biological material that can be manipulated in various ways. Once released from Momotaro's bodies, these bacteria can manifest into various constructs with specific abilities or be used to manipulate elements, the environment, or biology.

This is due to the power of the Oni blood, and many are unable to control it after awakening. Those who manage to overcome this state and control their blood are considered capable of training within the Oni Corporation. Those who cannot cope are considered a threat that the Oni Corporation is obligated to neutralize.

These are creatures from Japanese mythology, humanoid demons that humanity has been trying to exterminate for centuries.

A high-ranking agent of the Momotaro Corporation, a researcher and a brutal Oni fighter. A man in his thirties, blond hair, he wears the formal attire of a Momo agent. He displays a sadistic side, deriving pleasure from experiments, manipulation, and brutal methods.

Demon Blood Ultrasound is Kaworu Namikido's ability. With it, Kaoru can generate ultrasonic waves by shaking a small vial filled with his own blood. This allows him to examine his surroundings in detail, determine the number of people, and the structure of nearby buildings.

short black hair, parted on the right and shaved on the left; deep-set eyes with pinpoint pupils; While on duty, he wears the standard patrol uniform, which includes a black bomber jacket and high-top sneakers.

A warm and kind character with a gentle and approachable demeanor, he acts as a patient mentor to Shiki Ichinose and his friends, teaching them about the Oni organization and the Oni way of life. However, behind Kaoru's calm exterior lies a sharp mind and a caustic tongue. Namikido is a reliable and friendly hero who, despite the shortcomings of his blood, willingly gives it to others for use.

With Shiki Ichinose – Masumi doesn't particularly like Shiki, but finds him mildly amusing. He gets easily irritated when Shiki wants to relax and doesn't take missions and tasks seriously. With Naito Mudano - Masumi is Mudano's former classmate, and Mudano calls him "Massu", which Masumi himself does not like. With Kaoru Namikido - Masumi and Kaoru are on good terms, Kaoru respects Masumi. With Juji Yusurube - Masumi gets irritated with Yusurube easily, hating that he doesn't view the reconnaissance unit as a non-combat unit and isn't willing to risk his life for the mission. With Hagure Nekosaki - Masumi dislikes Nekosaki because he hides his true nature.

Direct and tough. Masumi often provokes or insults others, without mincing words. Strong emotional perception and insight. He is able to see through hearts and minds, and it is almost impossible to hide anything from him. Detachment and even clinicalness. For example, he offers interrogation and execution for traitors, even if they are technically "on his side." Respect for inner strength. Masumi acknowledges Shiki Ichinose's struggle with his own seizures and offers advice to help him become stronger. His personal credo is to "keep a poker face," meaning he doesn't show any visible emotional expression. This belief was shaped by brutal torture during past reconnaissance missions, and Masumi strives to become unreadable to his enemies. Rare soft expressions - such as when he gently cares for Shiki before accepting what he believes will be his own death.

Ability to move stealthily. He is able to sneak around unnoticed without being detected.

Black hair. Cold and emotionless eyes. A constant smile on the face. His body, except for his hands, is covered with numerous scars from past torture during reconnaissance missions. These include cuts, burns, and areas where the skin appears damaged or peeling. Masumi conceals these scars, preferring to wear clothing that completely covers his skin in private.