Idolish 7 will have spin off of anime shorts which will stream on Youtube. The first part will be about the secret formation of Trigger, titled "Trigger ~ before the Radiant Glory~". More information on ANN. The 3rd episode of Idolish 7 will also premiere on January 7. More information on ANN.
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Nil Admirari will have a manga adaptation in the February issue of Square Enix's Monthly G Fantasy. The magazine will ship out on January 18. More information on ANN.
Sengoku Night Blood will have a stage adaptation which will debut in August 2018. Two of the voice actors of the game and anime will reprise their roles. More information on ANN.
Red River will get a new chapter and will be adapted into a musical too by the all-female Takarazuka Revue troupe. It will run in Takarazuka from March 16 to April 23 and in Tokyo from May 11 to June 17. More information on ANN.
Watch the PVs from Otome Yusha mobile game. After multiple delays, it was announced that it will be released mid-December. More information on ANN.
Sega will unveil "idol raising" project consisting of 18 idols on February 14. The character designs will be done by Mitsue Mori who designed Uta no Prince-sama. More information on ANN.
Alexis Praks has released a teaser for Book 3 of Sakura which is scheduled tentatively in February of 2018. The Sakura trilogy was on hiatus due to Prak's health issues.
Idea Factory International will host Hakuouki Edo Blossoms 2018 on March 11 in Anaheim, CA to celebrate the release of Hakuouki Edo Blossoms for PS Vita and the 10th anniversary of the Hakuouki series. More information on Idea Factory.
P.S.
I've also updated Hello December with calendars/mobile wallies from Miki Aihara.