A homeroom teacher held 29 students hostage as vengeance for the mysterious death of their roommate. Their act takes a toll on life and sorrow. This bloodthirsty lesson brings up the raw characters of human beings.
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.