It's been a year since Misumi-senpai died. Fujinami Kou is still mourning in his heart for him when he accidentally meets Kakitsubata Saki who is a year younger student in his school and looks just like Misumi. The quiet Kou and the straightforward Saki become friends and with time they learn more about each other leaving Saki torn when he happens to get in his hands Misumi's diary. What is the right choice?