The cast list for the upcoming Jidaigeki drama (these are the popular samurai drama series, though should not be confused with Taiga dramas which are NHK exclusive) Chushingura, Sono Gi Sono Ai has been posted on TV Tokyo's OHP the cast list for it and Arioka Daiki is on it. He will be playing the character Oishi Chikara.
The series is set to begin the first episode on January 2nd, 2012.
From the cast page it looks like this telling of Chushingura (47 Ronin) will focus more on the women of the story. Of course since Arioka's character is the son of on of the main character's Kuranosuke and the character's mother of course looks to be playing a big role in this I think there's a pretty good chance that Arioka will get a good amount of screen time. Of course the fact they have him give a comment about the role on the sight as well bodes well for him.
Jidaigeki tend to run longer than the usual seasonal dramas so I'm curious how long this one is planned as I can't see that information. But in any case I'm really glad to see Hey! Say! JUMP members get drama roles. Especially members that haven't either had any before or not in some time.
I guess we should now be prepared to see him with the usual wig the guys have to wear for these jidaigeki, the one where the top of the head is completely bald while the hair on the side and back are put up in a kind of ponytail thing. I can't say I can really picture him now like that but I'm sure it'll look just as strange as Takaki Yuya's did when he was in those drama specials with Tegoshi Yuya years ago.