I Joined a Cult and Became Cthulhu in Tokyo

After web novelist Li Yu suddenly dies, his soul transmigrates into the body of a man named Sato Kenji in Tokyo, Japan. To survive, he is forced to join a church called the Church of the True Path to Salvation. However, he soon discovers that ghosts and gods really exist in this world. This is the story of Li Yu struggling to survive on the edge of madness in a supernatural world where ghosts and gods are like those of the Cthulhu Mythos.