"You, who feel more distant from me than anyone else, are the only person I want to understand better." Kasumi and Kei have been friends since they were just little kids. Kei always watched over Kasumi as she would innocently run into any situation with a smile. In their last year of high school, on Kasumi's 18th birthday, she declares that she wants to go with Kei to the love hotel in their town as a birthday gift?! Ever since her confusion on what happens there was settled, the two haven't been able to talk to each other. However, that begins to change after the two find their way to the same university.