Wager

Wager (賭け, Kake) is the fifteenth episode of the Death Note anime.

Synopsis
Light asks Rem to kill L to which she agrees. However, Light has to decide whether or not he wants to kill him the very next day. L appears at the university and tells Light that if he dies in the next few days, it would mean that Light is Kira.

Soon after, Misa shows up and finds out L's real name with the help of her Shinigami Eyes. When she leaves, Light attempts to call her cell phone but finds out that L had stolen Misa's phone. L informs Light that Misa has been arrested. Three days later, Misa forfeits ownership of her Death Note in order to be sure that she would not give in and reveal information about the Death Notes and Light.

Rem seeks out Light and warns him that if he doesn't save Misa, she will kill him. Light acknowledges this and comes up with a plan to free Misa.