Kajio

A light-haired anime character with a blue bow falls backward through a dark, starry space with glowing particles, then the scene cuts to two anime women in bikinis underwater, one with light hair and the other with dark hair, both looking surprised as they swim forward, followed by a close-up of their backsides in swimsuits, then a blurry transition, then a shot of two women in swimsuits from behind, one with brown hair and one with red hair, dancing or moving rhythmically.