The official website of the The File of Young Kindaichi Returns anime announced that a one-hour special television episode of the anime titled "The File of Inspector Akechi" (Akechi Keibu no Jikenbo) will air on December 26. The site streamed a trailer on Sunday, which previews the episode and its story. The video also reveals that Yudai Chiba will play Ryūtaro Kobayashi, a junior detective under detective Kengo Akechi. (Source: ANN)
Anix is the best site to watch
Kindaichi Shounen no Jikenbo Returns 2nd Season: Akechi Keibu no Jikenbo SUB online, or you can even watch
Kindaichi Shounen no Jikenbo Returns 2nd Season: Akechi Keibu no Jikenbo DUB in HD quality. You can also find
Toei Animation anime on Anix website.