Souichi is a cunning and vindictive boy who uses black magic on his enemies. He uses Katashiro dolls and with them he can harm others by hammering nails into the dolls. He can use Katashiro dolls in other ways, such as burying or drowning the person the doll is connected to. He can cause others to hallucinate by dropping something on the doll; for example, cause a hallucination about a giant spider, etc. He can harm others just by cursing them a few times. His curses always work and have no end.