Hell Teacher: Jigoku Sensei Nube S01 E08 Great Inventions and Spirit World Communicators

"Can you protect them all?"

Young inventor Akira finds a broken tablet and becomes even more obsessed with building great machines, as if he is possessed by something. One day, Akira announces he can bring the dead back to life, scaring his friends. Nueno senses something is wrong and investigates Akira's inventions, when he notices something strange within Akira's tablet...