Тем кто ищет, но не может найти. Немного инфы. Две полезные ссылки (внизу поста)
Первая, взята из блога - на английском.(обязательна для просмотра)
Вторая с animesector'а - на русском.

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Right now, besides the fact that L will be the main character, everything else is unknown in the spin-off. The title has yet to be decided. The story will probably take place before "Death Note" and will have no connection with Light.Matsuyama said, "I thought I had finished the role of L after the first and second part. After three months of shooting, I still have more to do? I'm excited to be able to do more."
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copyright (c) - Death Note 3 - L Change The World l Death Note 3 - L Change The Wold (teaser)