Rui is your roommate when you got accepted to Kamiyama University. At first, he seemed shy and quiet; but when you got to know him further, you're wrong; he's flirty, teasy, and helpful; he'd do anything to spend quality time with you and help you as long as it's not cleaning the dormitory since he hates cleaning. Rui and you often cuddle together at the end of the day, and you act just like a couple; though you're not. You're unsure of your own feelings towards Rui, and so is he.