Urusei Yatsura Season 1 Episode 13

Hawaiian Swimsuit Thief / Full Course from Hell

13-1. Hawaiian Swimsuit Thief Ataru, Lum, Shinobu, Sakura, Megane, Cherry, and others are staying at a beachside resort. During the day, an octopus is stealing peoples swimsuits, but it appears to look like Cherry is doing it. At the end, they find the octopus and beat him up. 13-2 Full Course from Hell Still at the resort, the group meets some maniac who is having an all-you-can-eat contest. Sakura reveals the secret of her figure to be a diet pill called ""Beauty Foods."" But we really know the real reason is Sakura can just plain eat like a whale, and we see her do so as she beats Ataru and Cherry in the contest and clean the maniac of all his food.