Nagi Oshima quits her job, cuts off everybody she knows (including her boyfriend), quits social media and cancels her cellphone. To restart her life, she moves to an old apartment in the suburbs of Tokyo. She wants to have a pleasant and free life, not caring about other people.

A story that begins when a husband, who lost his beloved wife ten years ago and lost the meaning of life, and his daughter are unexpectedly reunited with their wife/mother. As his wife is reborn as a ten-year-old elementary school student, the family is reborn.