Light believes that there is another Kira because the FBI agent who was after Light died without Light's intervention. Meanwhile, Light suspects that L has planted a surveillance camera in Light's room.
Misa confesses to Light that she has the Death Note and the Shinigami Eyes. Light tries to find out L's actual name using Misa's Shinigami Eyes.
Misa is detained on suspicion of being the second Kira, and she, unable to bear the interrogation by L, asks Rem to kill her. Meanwhile, Rem orders Light to save Misa, and Light visits L to clear his suspicions.
Unconvinced that Light is not Kira, L decides to put Light under 24-hour surveillance. In order to prove his innocence, Light offers to cooperate in Kira's arrest.