Adapted from a Princess Soft game Junna, the main heroine, has a twin sister named Senna. He is a regular student at an exceptional institution. However, in the past, a car accident took away both his parents and his memory. Junna survived the accident and has exclusively lived with his sister, despite the fact that he has been cared for by his family. And the current... Life in the same high school with Senna is so wonderful that he can forget about his difficult history. Because he has lived in a world where there is only Senna, his experiences in this town, such as the start of a new life, new situations, and meetings, are quite refreshing. However, he begins to recollect the memories he lost in the accident.