Koyomi (played by Misai Eto) is a girl who runs a small Taiyaki shop by herself, and Yukisuke (played by Taiga Nakano) is a bioarchaeology assistant who often visits this shop. The strong and beautiful Koyomi gradually attracted Yukisuke's attention, and he wanted to know more about this girl. As time went by, the exchanges between Koyomi and Yukisuke became more frequent, and the two lonely hearts got closer and closer. At this juncture, an accident happened. Koyomi suffered a head injury in a car accident and lost a small part of her memory, and this memory happened to be about Yukisuke. In order to make Koyomi recover, Yukisuke stayed by her side every day, trying every means to awaken Koyomi's memory of herself.