This romance hentai anime Kateikyoushi no Onee-san The Animation part 2 based on erotic game by Atelier Kaguya and shows a story how the dad of young guy Touya left for his business trip. He decided that his boy needs a care while he is away. He found 4 beautiful women tutors who will take care about Touya. Their names are Rio, Nagisa, Amane and Sara. They should be a live-in home tutors. But their lessons include not only book learning.