Naomi (Maki Horikita) is a high school student at Tokyo International School. Because of an accident, she fell down the stairs. In addition to suffering physical pain, she also lost the memory of the past four years. The only thing engraved was the scene of her kissing someone. Because of such memory fragments, they always appear vaguely, so that she began to identify them with people in reality. Gradually, the vague figure was locked on three men: including the kind senior (Kenichi Matsuyama), the kind classmate (Yuya Tegoshi) and the American student (Anton Yelchin). Naomi then began to show her affection to these three men, hoping to find the signal of true love from the clues. However, due to various reasons, it is always impossible to get what you want. The shadow in the memory and the lover in reality always seem to be a little different and difficult to connect. By chance, Naomi regained the memory that had been lost for four years. She woke up from a dream and found that it was him that she really loved...