Moeba is a spoiled, Meba little sister. And her brother is constantly at her mercy. The brother and sister have a secret that they can't tell their parents about. Every night, after their parents have gone to bed, they secretly play dangerous pranks. But today, their parents are out and it's just the two of them at home... There's no need to lower their voices or hide anymore. There are no morals for the brother and sister who enjoy a deep, serious, intense time together...