Mato Seihei no Slave

Mato Seihei no Slave (魔都精兵のスレイブ, translated to "Slave of the Magic Capital's Elite Troops") is a Japanese manga series written by Takahiro and illustrated by Youhei Takemura, and published in the Shonen Jump+ online platform.

Predator

 * Kumadouji

Prey

 * Shushu Suruga

Scenario
After their ally Yuuki is kidnapped, Shushu Suruga and Sahara Wakasa battle one of his abductors, Koko Zenibako, who fights alongside a large bear-like monster called Kumadouji. During the battle, Kumadouji proves to be incredibly resilient against their brute force attacks. Thus, Shushu comes up with a plan to beat the monster, utilizing her power to change the size of her body. After shrinking her body, Shushu has Sahara toss her straight towards Kumadouji and she flies right into the monster's mouth and goes down its throat. Once inside Kumadouji's stomach, Shushu rapidly increases her size until she tears the monster apart from the inside out, defeating it.

Predator

 * Kuusetsu

Prey

 * Naon Yuno
 * Koko Zenibako

Scenario
After abducting Naon Yuno and Koko Zenibako, two humanoid shuukis, the Gods of Thunder present their unconscious bodies to Kuusetsu, a large egg-like creature that is to become another Thunder God. Kuusetsu looks them over and, apparently pleased, opens up its large mouth and devours Naon and then Koko. The other Thunder Gods remark that Naon and Koko will become "batteries" for Kuusetsu and remain part of its body for eternity. Naon and Koko remain trapped and unconscious inside Kuusetsu's body and their clothing dissolves as it begins to incubate.

Subsequently, in Chapters 54 and 60, it is revealed that Kuusetsu has taken on a female form, inheriting Naon and Koko's physical traits, as well as their personalities and abilities.

Predator

 * Kuusetsu

Prey

 * Mira Kamiunten

Scenario
After intercepting Kuusetsu, who had been previously abducting young women in the human world, Mira Kamiunten, Chief of the 2nd Unit of the Anti-Demon Corps, engages in an intense one-on-one battle with her. Mira gives it her all, delivering significant damage to Kuusetsu, forcing her to transform to a more powerful form. Mira delivers a nearly fatal blow, but having used up a large portion of her strength to save the surrounding city after Kuusetsu unleashed a hoard of monsters on it, she is unable to prevail. Kuusetsu mocks Mira's efforst, but, defiant to the end, Mira declares she had fully intended on defeating her. Kuusetsu is impressed by Mira's strength and beauty, and the two have one final clash from which Kuusetsu emerges victorious. With Mira unconscious or too weak to resist Kuusetsu opens up her abdominal mouth and swallows her. Mira's allies, Kyouka and Yuuki, arrive on the scene too late to save her and watch in horror as Kuusetsu finishes devouring her. Kuusetsu absorbs Mira into her body and gains some traits of her appearance and personality as well as her ability to clone herself.

Subsequently, in Chapter 80, Mira, along with Naon and Koko, are released from Kuusetsu's body when Kyouka and Yuuki pierce her body, rescuing them. Kuusetsu reverts to her egg form and her body is destroyed by Kyouka, but her soul lives on inside of Yuuki whom she previously inserted a portion of herself into.