Hirofumi Mizui wakes up ready for yet another day of middle school. The only problem is that he is actually in his second year of high school. Two years have passed since he was involved in a car crash that robbed him of his memories, and while his memories of life before the crash have returned, the memories of the interim period are completely gone.

After visiting his doctor, Hirofumi runs into a frustrated Daigo Furubayashi, who insists that they have been lovers for some time despite Hirofumi not recalling this at all. Shocked that he seemingly is gay, Hirofumi does not know what to do when a letter he wrote to himself confirms his worst fears. Trying to put the pieces of his life back together, Hirofumi has to decide whether to accept Daigo's love or to push him away forever.