I Got reincarnated but my only ally is a little girl with cheat powers!?

Synopsis

After saving a girl from delinquents, Kai is caught in a car accident and awakens in the Shadow World, a realm between life and death where shadows manifest as powerful Shadow Beasts. He discovers he isn't truly dead and, accompanied by his shadow, a young girl, he begins a quest to return home. This action-fantasy series follows Kai as he navigates a world filled with dangerous power struggles. As he journeys through this mysterious land, he becomes entangled in its conflicts, facing unexpected threats and challenges. Will Kai ever return to his old life, or will the Shadow World claim him forever?