Narumi Takayuki (voiced by Taniyama Kisho), Taira Shinji (voiced by Aoki Joh) and Hayase Mizuki (voiced by Ishibashi Tomoko) are good friends from their school days. Graduation is imminent, and the three are about to head for different futures. One day, Narumi Takayuki met a girl named Suzumiya Haruka (voiced by Kuribayashi Minami), and with the help of Hayase Mizuki, Narumi Takayuki and Suzumiya Haruka got together. In fact, Mizuki has always secretly liked Takayuki. On her birthday, she found Takayuki who was about to date Suzumiya Haruka, hoping that he could give her a ring as a gift. However, when Takayuki said goodbye to Mizuki and came to the date, what was waiting for him was the bad news that Suzumiya Haruka fell into a coma due to a car accident. Three years later, Suzumiya Haruka woke up from the coma, but her memory still stayed on the day of the accident three years ago. Little did she know that Takayuki and Mizuki had already come together at this time.