H03228 Ane Jiyoku Tsukushi: Nee-san no Shitagi Ep 1

Mizuki is an ordinary student with two older sisters, the perfect council president Ema and the idol-like Ryuka, who tease and use him as a servant. When Mizuki gets a girlfriend, both sisters become more proactive with him, leading Ema to shed her own layers. The episode runs 24 minutes.