A legal apprentice Rei and his fiancée Sawa are a happy couple. However, there is a big secret that Rei cannot tell anyone--he killed his father 11 years ago. One day, Rei receives an anonymous message indicating someone knows his dark past.
Shoko slips and falls on the stairs at work, but Rei is suspicious of her story. In the meantime, Rei and Sawa plan to go to the fireworks show, but Shoko opposes the idea, worrying that the fireworks may cause Rei to remember the horrible events that took place 11 years ago.