Webduring the final battle in the infinity castle, shinobu faces her sister's killer, doma. As shinobu approaches the demon, he is just consuming one of her disciples, an act which. Do you think shinobu would’ve lived if she had a demon slayer mark in her fight against doma and then kanao and inoske would’ve arrived to help? Webin the infinity castle arc, the insect hashira, shinobu kocho, faces off against the ruthless upper rank two demon, doma. the battle begins as doma, already in the midst of.