Black Torch

Seventeen-year-old Jiro Azuma comes from a shinobi family and possesses the unusual ability to speak with animals. His quiet life collapses after he rescues a black cat named Rago and discovers that the animal is actually an immensely powerful mononoke. When a hostile spirit attacks and leaves Jiro mortally wounded, Rago chooses to merge with him rather than let him die, granting the boy supernatural power he never asked for.

Their fusion draws the attention of a secret bureau that hunts mononoke and pulls Jiro into a hidden war between humans and spirits. With Rago's strength inside him, Jiro must learn to fight without losing the compassion that made him save a strange cat in the first place.