In this chapter, we are introduced to sakuwa and her twin brother, komachi, who have just returned from a night out with hiraji and his friends. They are in the middle of a conversation when they are interrupted by the sound of a knock at the door. As they approach the door, they are surprised to find that it is Hiroyuki's house and that he has come to pick them up. They do not want to disturb him, but they are afraid that he is mad at them and that they will not be able to help him. They decide to go back to the house, and when they arrive, they find that Hiroyuki is already there. They ask him what is wrong, and he tells them that they should not disturb him. He tells them to go home, and they agree to do so. When they return, they discover that they have been interrupted by a knock. They realize that it was Hiroyuki who had woken them up, and that their mistake was that they had not gone to find him earlier. They apologize to him for their mistake, but he is still angry at them for not having gone earlier. He asks them to leave him alone. They agree to go, and as they are about to leave, they hear a knock on the door and realize that they must have come to find Hiroyuki. They look at each other, and then they realize that the knock was from Hiroyuki and that it came from the same man as they had seen earlier in the night. They feel that they are in danger of being interrupted, and apologize to each other. They leave, and the noise of the knock is heard in the distance. The noise is