Funny ecchi

A pink-haired girl in a red polka-dot bikini lies on the ground in a cave, then sits up with a shocked expression, while a boy with spiky black hair and a yellow shirt looks on in shock from behind her. The scene cuts to a character with a glowing red eye peeking from behind a curtain, then to two girls in a room, and finally to a close-up of the boy's face with wide, terrified eyes and a headband, set against a pink, glowing background.