Hara Nao (Yasuko Matsuyuki) is not married until the mid-30s.

She went on a study of migratory birds intently at the University of Muroran.

Meanwhile, the sudden closure of the university laboratory, Nao became the reluctant science teacher at a local elementary school.

She became a freshman homeroom teacher replacing a teacher on maternity leave.

Nao notices a student (Rena) in class with some bruises on her body. The authorities turn a blind eye to the child abuse. Nao decides to kidnap Rena to start a new life with her assuming flase identities. Their journey begins . . .