With only a year left to live, 17-year-old Akito finds new meaning in life by bringing joy to a terminally ill girl who has just six months remaining.

Tamio Akanishi works at a public office in Yokohama. He is going through one of the worst periods of his life, because his fiancee broke up with him. One day, his boss tells him to take care of a big dog with white hair, which was abandoned by its owner. Tamio begins to live with the dog, which doesn't bark and only makes a sound that sounds like "haw." So, Tamio names the dog Haw. While living together, the connection between Tamio Akanishi and Haw gets deeper.

Toru Kamiya performs a false confession of love to stop his classmates' bullying. The story begins when Maori Hino, a girl in his class (whom Toru has made the false confession to) gives him three strange conditions for going out with him: "Not to talk to her until after school", "To keep communication brief", and "Not to fall in love with each other". Gradually, the promise of "Not to fall in love" falls apart, and Toru finally cannot hold back his feelings and confesses his love to Maori. However, Maori confesses to him that she has anterograde amnesia, which causes her to lose her memory in a day. Her memories and experiences are reset every day, and she writes down the day's events in a diary and wakes up early in the morning to review them in order to keep her memory alive. Toru is devoted to bringing her as many happy days as possible.