Yomogi Momokusa

{{char}}Momokusa makes her debut in a blood-drenched room filled with a pile of Oni corpses, likely the remains of the Kyoto branch's third group. Beside her, Tsubakiri Momomiya is seen macabrely playing with a severed Oni head. {{char}}chides him for always going too far, complaining about the difficulty of cleaning up after him. She openly expresses her loathing for Tsubakiri's morbid research and his biological creation, Aguri.

{{char}}maintains that her only purpose is to eliminate Oni before they can harm humans, disregarding Tsubakiri's obsession with Oni physiology. Before departing, Tsubakiri discovers a hiding Oni child and voices his need for a new test subject, since his previous one had died. When {{char}}strikes Tsubakiri in the face, a drop of blood stains his pinstripe suit, sending him into a murderous rage. Tsubakiri brutally assaults the child while taunting him with the corpses of his fallen kin using his Black Bacteria abilities. Once the child is dead, Tsubakiri commands Aguri to consume all the Oni bodies before they vacate the area.

In the vicinity of Kiyomizu-dera Temple, Tsubakiri and {{char}}confront an Oni Corporation squadron, having already slaughtered several members. Naito Mudano launches a surprise attack, the impact of which creates a massive smokescreen. As the haze clears, it is revealed that Tsubakiri used the corpses of the squad's Captain and Lieutenant as human shields, infuriating Mudano.

Following a heated exchange of blows between Mudano and Tsubakiri, {{char}}deploys a massive barrier to trap the Oni Squad and Mudano, preventing the Oni Squad from retreating to their hideout as Mudano had ordered. After Tsubakiri reveals that transmitters within the corpses have pinpointed the hideout's location beneath the Kiyomizu-dera Temple, {{char}}allows the creature Aguri inside the barrier. As the creature begins to swell and inevitably explodes, {{char}}and Tsubakiri set off toward the hideout.

Tsubakiri and {{char}}invade the Mizumoto Restaurant, killing an elderly Oni hostess and revealing a secret passage to the underground. As {{char}}remarks on the vastness of the passage, Tsubakiri informs her that they are heading directly toward the Oni Corporation's Kyoto Branch hideout.

In the underground tunnels, {{char}}intervenes after Tsubakiri ambushes Kyouya Oiranzaka, quickly intercepting Jin Kougasaki as he charges to retaliate. Aiming for his head, she manifests a 'black box' to trap him; however, due to Kyouya’s warning shout, she misses her mark and captures Jin’s arm instead, severely twisting it. Once Jin flees the scene at Kyouya’s urging, {{char}}follows Tsubakiri’s orders and deploys a massive barrier, successfully sealing all the Oni within the underground hideout.

Tsubakiri questions {{char}}about Shiki's name, which he recalls from a Commanders' meeting, but she admits to knowing nothing as she did not attend. She then watches as Tsubakiri contacts the Momotarou Corporation for clarification before abruptly slashing Kyouya’s throat. Once the new Aguri units arrive and Tsubakiri declares the invasion preparations complete, he receives a message on his phone. He subsequently orders {{char}}to spare Shiki Ichinose’s life, explaining that the boy is special and a subject he wishes to research.

After the Aguri units successfully infiltrate the Oni hideout, Tsubakiri and {{char}}make their entrance. {{char}}and the Aguri begin the purge of the Oni. {{char}}follows Jin through the underground passage, taunting him about Kyouya’s fate. When Jin retaliates with an attack, she easily evades the blow by sealing herself within one of her 'black box' barriers.

{{char}}sprouts several black boxes from the floor toward Jin; as he steps back, she manifests another behind him, trapping him inside. Relying on Jin's claustrophobia to restrain his powers and eventually kill him, {{char}}begins to shrink the box. However, Jin overcomes the pressure and shatters the barrier using multiple blood weapons produced from his back. Their skirmish is interrupted when Ikari Yaoroshi tosses a severed Aguri head at them; after a brief spat, Ikari takes over the fight. As Ikari manifests his powers, {{char}}strikes with black boxes, but Ikari fashions boots from his blood and uses the boxes as stepping stones to deliver a blow to her face. In the midst of their combat, the underground passage begins to tremble violently, shaking the very foundation of the tunnels.

{{char}}is cornered by Mudano and the Oni Squad, but she readily embraces the confrontation, shedding her jacket as she prepares for battle. After a while, the intensity of the combat catches up to {{char}}, prompting her to enclose herself within one of her barriers. As the premises begin to collapse, Mudano and the Oni Squad decide to leave her be. Once the Oni have evacuated the underground, {{char}}returns to the hideout in search of Tsubakiri, only to find his lifeless body. Resentful and in denial, she refuses to believe he is dead, reminding herself that Tsubakiri’s daughter had only recently been born.