Suffering from hallucinations and sleep paralysis, an American exchange student studying abroad in Tokyo discovers that he has become host to a fox spirit responsible for a series of attacks that vary from mischief to malice.

Saying the lead is an American exchange student, and then saying he is studying abroad, is redundant.
-----
When an American exchange student in Tokyo discovers he's become host to a fox spirit, he must... (Then tell us what he must do)

The logline sets up a situation, but portrays the main character as a passive victim --"he has become host to a fox spirit".?

After the exchange student realizes he's?become a host, what does he do about it?? What must he do?? What?becomes his objective goal?