[Machine Translation] Hikaru was at a study camp at Nagi and Arashi's house to improve his bad grades. Then, their parents suddenly returned from overseas for a short visit! Hikaru, who had not seen his parents since he was a child, was nervous about what they would think of him, but he was relieved to find that they accepted him without hesitation. He thought he would be a distraction to the family reunion, but they quickly returned to their hotel. When Hikaru waits for Nagi and Arashi, who have gone to see them off, they come back looking different from usual. ......What's going on? The book also includes a summer vacation episode in which Hikaru and the twins attend a summer otaku event and go to a festival! The long-awaited fourth volume of the triangle love story between the good-looking twins and the shady rotten boy!