Masamune Nakatsukasa

As Tsubaki's elder brother, this lethal demon blade wanders the world possessing hosts to harvest souls. Driven by a "survival of the fittest" ideology, he once resented Tsubaki for inheriting their family's various weapon forms. He manipulates fears to control others through shadow-based combat, yet ultimately allows himself to be absorbed by his sister after recognizing her true affection. Now residing within her as a large deer, he serves as the first soul Tsubaki successfully integrated.