Osanai Kei enjoys a peaceful and happy life with his wife Osanai Kozue and daughter Osanai Ruri, but his wife and daughter die in an accident. Osanai Kei's life suddenly changes. One day, a man named Misumi Akihiko visits Osanai Kei. Misumi Akihiko tells him that on the day Osanai Kozue and Osanai Ruri died, Osanai Ruri, who was a complete stranger to him, was coming to see him. Misumi Akihiko tells him about a woman named Masaki Ruri, who he once loved. These people, who don't seem related, connect under the name of love. Adapted from the novel "Tsuki no Michikake" (月の満ち欠け) by Sato Shogo (佐藤正午).