He leaves

With the test successful, Kiyoshi concentrates and recites the spell again. Katerina's body begins to spasm as his spirit is ejected from her body. Now back in ghostly form, Kiyoshi observes Katerina's now unconscious body. She was still breathing, which is good. It got even better when he saw her slowly regain consciousness.

"What happened?" She wondered as she rubbed her head. He kept his eye on her noticing how she seemed to not quite recall being possessed. Feeling somewhat satisfied he decided to leave her alone. He phased out of her house and headed back to his room. Once he was safely inside he returned to his original body.

"Well that was quite the experience," He thought as he got readjusted to his own skin. The Spell had worked and he was able to possess someone. All in all it was absolutely absurd and mind boggling how such power even existed and more so, how easy it was to access. Made him curious just what were the limits to such power and more so, how many other people knew and abused it.

Smiling to himself....Kiyoshi decided it was up to him to figure out.