Having managed to grab the right person this time, Mousse sets up a new show - girl turns into duck (courtesy of a little cursed water from the spring of drowned duck).

Ranma is determined to infiltrate the Furinkan High girl's locker room when he gets a map from Ryoga that shows there's a old spring beneath it that can cure his curse. It proves harder than Ranma thought though, since the girls are on high alert due to the recent raids by Happosai.