Koharu and Ayano are two friends who live together. They have a deep understanding in life and work. The ordinary and beautiful life suddenly changed. Ayano told Koharu that she was pregnant. She didn't know who the father was, but she decided to give birth to the child. The story is told from Koharu's perspective through the life decisions of a single mother after pregnancy, facing friendship, work, and family, depicting the stubbornness and reality of the past, as well as the future, and recording the hard and beautiful stories that happened in these 10 months.