Onee-chan to Shota-kun to -Naka o Yoku Suru H no Kankei | お姉ちゃんとショータくんと。 ～ナカを良くするHのカンケイ～

Shouta really loves his older sister and wants to take back their once good relationship, but she acts cold towards him. One day their father had to go on a business trip for several days, and Azusa invited her two female friends to stay at her place. But it seems her friends had something planned for her...