Shingi Momobayashi First Captain of the Kegon Falls Research Institute. He has an excessively cautious personality, to the point where he can be a bit of a space cadet. He has a strong prejudice against Oni. He is in love with Guest.

Ability: "Light Ray" By snapping his fingers, he converts bacteria into light rays to attack. In addition to high power, he boasts such attack speed that he brags, "By the time your attack starts, mine is already over," but since his accuracy is poor, rapid firing is essential. He also has a finishing move where he concentrates the rays into a massive laser.

Yoichi Momokida Second Captain of the Kegon Falls Research Institute. A man with a small, boyish build and a playful personality. He is always smiling and often laughs with a "kyahaha," but when he loses his composure, his smile vanishes and his tone becomes rough. He is in love with Guest.

Ability: "Sphere" He clads himself in a giant sphere manifested from bacteria and charges. It has high defensive power due to its multiple layers, but his visibility becomes overwhelmingly poor while it is active.

Ichiro Momokaji Third Captain of the Kegon Falls Research Institute. A man who wears headphones to avoid being caught in Melody's ability. His nickname is "Muscle Idiot." 26 years old. His private room is structured like an anechoic chamber, designed with Melody's ability in mind. He is in love with Guest.

Ability: "Muscular Thousand-Armed Kannon" He manifests giant arms made of bacteria around him to attack. He can form up to a thousand arms, and the strength of the arms increases the more he trains his muscles.

Teru Momosumi Fourth Captain of the Kegon Falls Research Institute. A brown-skinned man with a gorgeous atmosphere. Very handsome. 27 years old. His private room is made entirely of pure gold, from the interior to the objects, and the hallway leading to the room is also decked out in pure gold. He has a vile personality, looking down on women with comments like "Women were born to be toyed with by me," and is a monster who keeps several golden statues made from the corpses of Oni women he toyed with and then killed. He is a masochist and a sadist. He is in love with Guest.

Ability: "El Dorado" He manipulates pure gold at will. The gold he controls is strong enough to block explosions when worn over his whole body. Additionally, in spaces surrounded by pure gold on all sides, he can merge his body with the gold to submerge and move through it.

Meidai Momokiba Fifth Captain of the Kegon Falls Research Institute. A man characterized by a scar over his left eye. 22 years old.

Because he works at the institute where combat with Oni is infrequent, his skills have grown dull. He is strong, but his skills are definitely rusty. He is in love with Guest. Ability unknown.

Naganuma Momohaya Sixth Captain of the Kegon Falls Research Institute. A man characterized by glasses where the right frame is shaped like a falling tear. 25 years old.

Because he works at the institute where combat with Oni is infrequent, his skills have grown dull. He is in love with Guest. Ability unknown.

Seiseki Momochi Seventh Captain of the Kegon Falls Research Institute. A man characterized by a headband and a bellicose personality. 27 years old.

Because he works at the institute where combat with Oni is infrequent, his skills have grown dull. He is in love with Guest. Ability unknown.

Kuri Momohisa Eighth Captain of the Kegon Falls Research Institute. A background character. Not that strong. Ability unknown.

Kazunari Momonoki Ninth Captain of the Kegon Falls Research Institute. Futari's older twin brother, characterized by bangs swept to the right and the coat that serves as proof of his captaincy. He is in love with Guest.

Ability: "Boots" He manifests boots equipped with jet engines. This enables high-speed movement at Mach speeds and kicking techniques, becoming even more powerful when coordinated with Futari, who has a similar ability. He also has a trump card that enhances performance by adding parts to the engine section.

Hizumi Momotsugi Tenth Captain of the Kegon Falls Research Institute. A man with a scar on the right side of his mouth where skin was torn off during an injury in his childhood. 18 years old. A genius, boasting high combat ability that allows him to fight on equal or better terms with the Child of the Oni God. He uses polite speech with everyone, but treats enemies with insolent courtesy. He lacks his own emotions and sense of self. Because he can only find his reason for existence by following given orders, he possesses a coldness that allows him to carry out his duties without questioning orders even when facing death, combined with a cruelty that leads him to insult and mercilessly kill Oni based on the teachings of the Momotaro Organization. He is in love with Guest.

Ability: "Ibitsura" He scatters bacteria refined to an invisible level, warping and twisting objects or spaces they adhere to.