Mana, a bright and diligent student, finds herself in a challenging situation where she must work as a private tutor to support her family, leaving little room for romantic pursuits. A fateful encounter with Taichi, her student, leads to a night of unforeseen events as a storm strands her at his house. To her surprise, Taichi's father, haunted by the loss of his wife, offers her shelter for the night. However, the lonely father's behavior takes a disturbing turn as he makes a questionable proposition to Mana in exchange for a substantial sum of money, exploiting her financial struggles and vulnerability.