An incident 100 years ago led to a professor’s creation of a monster with a human-like form but definitely not a human-like appearance. And yet, this immortal monster has more compassion than humans. He quietly hides deep in the forest and dreams of the day he can live as a human being even though he knows this is impossible. Then something results in his encounter with a young woman with an incurable disease named Tsugaru-san and falls in love with her. He starts to learn about love, friendship and the world. However, there is a secret. A monster cannot come into contact with a human being