On a thunderstorm night in an old house in Akita, international student Kai is writing his thesis alone, living an oppressed and lonely life. The fox demon Ren is attracted by the scent of Kai's inner longing to be thoroughly possessed, emerging from the shadows. Red foxfire entangles Kai's left wrist, forcing a deep throat that makes him swallow to the very depth, before slamming him down onto the tatami mat to thrust the entire rod from behind. Kai goes from struggling to having his waist turn soft and actively pushing backward, weeping as he cries out "Master," and softly begging after the act, "Please don't leave tonight.