Me and the Alien MuMu

Akihiro and the Tankless Toilet (1x20)

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Decimal is troubled by Akihiro's fixed gaze. It seems he is worried that he doesn't use the cat litter box, but as cat-like aliens have no concept of excretion, he doesn't really understand. While Sakurako is explaining how the litter box works, he bumps into Samezu?