Chapter 23 of the Boruto manga sees Koji Kashin test Team Konohamaru after their win over Ao, only for Boruto's hidden seal to awaken and turn the tide. The mysterious mark rescues the group and leads them to a wounded boy bearing an identical symbol.
Koji Kashin calls out his Boiler Toad and praises Team Konohamaru along with Katasuke for bringing down Ao. When Konohamaru presses him about Kara and what it wants, Koji answers with fūinjutsu that pins the group in place and readies himself to burn them alive. Konohamaru wrenches loose by triggering a release of his own, then squares off against Koji and stuns everyone by meeting his Rasengan with a matching one, produced without any scientific ninja tools. The mystery of who this enemy is only deepens. Judging Konohamaru capable yet still far from his level, Koji sets off a toad he had secretly attached to him, swallowing him in flames.
Desperate, Boruto reaches toward Konohamaru, and the mark on his hand flares to life, creeping across his body to Koji's astonishment. The Kāma drinks in Koji's fūinjutsu, freeing everyone to move, and then absorbs the fire off Konohamaru, who slumps down. Koji, who had believed Naruto struck the blow that killed Momoshiki, is taken aback to see the seal on Boruto instead. Boruto taunts him but drops before he can act, and Sarada steps in to shield him. Rather than press the attack, Koji surmises this is Boruto's first brush with the power, turns to leave, and thanks them both for the spectacle and for finishing Ao. Sarada tries to wring answers from him, but Mitsuki holds her back, urging her to tend to Boruto and Konohamaru; Koji, recognising Mitsuki as Orochimaru's child, nods at the wise call.
Once the two recover, they take stock of everything they will need to report. Mitsuki comes across a wrecked autonomous puppet unlike those they had faced, lying well away from the crash. Its condition hints at a formidable adversary, and Konohamaru wonders whether whoever carried the blimp's cargo made it this far. Chamaru then draws them to an unconscious boy sprawled among ruined puppets. Despite Konohamaru's worry that it could be a trap, Boruto goes to help him and spots the same mark on the stranger's hand.
Koji Kashin traps Team Konohamaru and fights Konohamaru, matching his Rasengan without ninja tools before setting him ablaze. Boruto's Kāma awakens, absorbing Koji's fūinjutsu and the flames to save the group. Koji, realising Boruto rather than Naruto killed Momoshiki, departs after thanking them. The team later finds an unconscious boy, Kawaki, bearing a seal identical to Boruto's.

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Chapter 23 of the Boruto manga follows Team Konohamaru after defeating Ao, when the mysterious enemy Koji Kashin tests Konohamaru in battle and Boruto's hidden Kāma seal suddenly awakens.
When Boruto reaches out desperately as Koji sets Konohamaru ablaze, the mark on his hand flares to life and spreads across his body, absorbing Koji's fūinjutsu and then the fire itself.
Koji had believed Naruto was the one who struck the blow that killed Momoshiki, so he is taken aback to see the identical seal awaken on Boruto instead.
After recovering, the team discovers an unconscious boy, later identified as Kawaki, lying among wrecked puppets and bearing a seal identical to Boruto's Kāma.
Koji traps the team with fūinjutsu, fights Konohamaru directly by matching his Rasengan without any scientific ninja tools, then sets Konohamaru ablaze with a toad bomb he had secretly attached to him.
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