Rain Leg Musha appears on floors 7 through 9 of Marukyu Striptease within the Midnight Channel on rainy days. It is unique from the Musha Shadows from Persona 3, replacing the Hakurou Musha. It uses the skill Rebellion to increase its Critical Rate in order do score critical hits on the party. It also absorbs all attacks but Electricity (its weakness), Light/Dark (both of which will be nullified), and Almighty. When defeated, it may drop Zero Board. Selling Zero Board at Daidara will unlock the Ame-Otoko male armor in the shop, which has the lowest defense of male armors available from Marukyu Striptease but adds 100 HP when worn.
In Golden, it appears on floors 5, 6, 9 and 10 of Marukyu Striptease. It may drop Lepidolite, Lemon Quartz, and Olive Stone for trade at Shiroku Pub. Selling four Zero Boards is enough to unlock the Ame-Otoko.