Ranma 1/2 : Back to the Way We Were...Please! (1991)
Directed by Tomomitsu Mochizuki / Junji Nishimura
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Synopsis
Ranma, Mousse and Ryoga each purchase Spring of Drowned Man powder from a Chinese merchant. When only one of the three packets turns out to be real, the trio decide to cooperate and travel to the mountains in order to test it.