Ranma ½: Season 1, Episode 86

1 - 86: Kuno Becomes a Marianne!

Azusa becomes convinced Kuno is a tanuki, a legendary creature with magical powers, and promptly adopts him as her 'Marianne'. Ranma and Akane are just happy that the two are keeping each other busy, until Azusa starts to suspect Akane wants to take her new pet away form her again.