Death Note: Desu nôto - Season 1 Episode 7

Light and Misa join forces with the task force in order to capture Kira. However, L's suspicions of the two do not waver as he suspects that they intentionally lost their memories by passing their powers to someone else. After realizing that they are under suspicion by the authorities, a group of Yotsuba executives enlist the aid of the investigator Babel, who is revealed to be Near in disguise. The efforts of Light, Misa and Near enable the task force to narrow down their suspicions to Yotsuba executive Kyosuke Higuchi. Using a fake television broadcast to lure him out, the task force is able to trap Higuchi and arrest him. Light regains his memories of being Kira and ownership after touching the notebook and killing Higuchi with a notebook scrap hidden inside his watch.