· actually, masachika had a younger brother, but he was killed by a goblin. Years later, the pair investigates disappearing children and ends up facing off against one of the twelve kizuki! So, despite her mothers opposition, she entered the demon slayer corps. Masachika saw her sanemi at the same time as her dead brother. Kimetsu no yaiba. While its not revealed which breathing technique masachika practiced, its safe to assume that he was a powerful swordsmen in his own right, as a tag-team effort between him and sanemi was able to successfully take down lower rank 1, the most powerful of the lower ranks. · demon slayer masachika kills a demon to save sanemi’s life, and then he takes the younger boy under his wing. As an established member of the corps, he played a role in facilitating sanemi’s training to combat demons effectively. · soon after, sanemi met a demon slayer named masachika kumeno, who not only introduced sanemi to join the demon slayer corps, but also considered sanemi to be like his own little brother. Prior to joining the demon slayer corps, masachika suffered the loss of a younger brother to demons, adding depth to his character. This guide provides detailed insights for both anime newcomers and devoted enthusiasts, including background information, signature techniques, and masachika ’ s relationships with other demon slayers. Plus more tales from the world of demon slayer : Learn how masachika ’ s journey inspires fans and helps shape the storyline of demon slayer. Masachika was already a member of the demon slayer corps, and not approving of sanemis near-suicidal method of killing demons, he arranged his former trainer for sanemi so he could properly learn how to defeat demons.