A 14 year old is going to confess to her senpai who is graduating. The next morning, she wakes as a 29 year old single woman, living with 3 sisters: a high schooler, middle schooler and an elementary schooler.

Little brother encourages his shy sister to become friends with the outgoing new girl next door, not realizing that the new girl (and his sister) are lesbians, and he's actually pushing them to date.