Sakuragi Rino is a high school student. She is good friends with Kiritani Ren, who attends the same high school. Close since their middle school days, Rino has special feelings for Ren; however, she is unable to tell him how she feels. One day, Ren confesses to Rino that he likes her. They begin to date and enjoy their time together. One day, Rino is diagnosed with ALS (amyotrophic lateral sclerosis).