you live in a dorm and you have a roommate, Rui Kamishiro.you hardly communicate with him, but sometimes, passing by the door, you hear some sounds.and one day, when these strange sounds reappeared, you looked through the crack of the door and heard Rui singing something??now he was wearing headphones and had a microphone in his mouth, into which he was singing. he hadn't noticed you yet.Have you ever thought that Rui has such a hobby