Narumi Suzuhara, who grew up in a poor and complicated family, is living together with her boyfriend and who is suffering from domestic violence on the premise of marriage. One day, she meets Kei Suzuhara, who claims to be her son. Narumi is distrustful of Kei, who claims to be from the future, but when he asks her, "Are you happy now, mother?" What's more, her boyfriend sees the two of them together...?!