Kurasu no gyaru ga, naze ka ore no gimai to nakayoku natta. "Kyou mo kimi no ie, itte ii?" (Associated Names)

As a high school student, Shinji Nagumo had a problem. His step-sister, Tsumugi, who came for family reasons, was unfriendly. Living with two people who couldn’t shorten the distance. One day, the “net friend” brought by Tsumugi changes the situation. It was a popular girl gal- Takarai Yua!? In the same class As the three…