seeing Kamenashi has a big role instead of a cameo like the rest of the other Gokusen alumni, i think they could sing theme. either KAT-TUN or Hey! Say! JUMP...but who knows.
BANDAGE, from what i've read is about the struggles of making it to the music industry? i think Jin's the leader/main vocalist of the band.
actually, i watched a news clip about the Gokusen movie & i think they wanted to level out the cameos. 3 from each season (Kame not included in the list since he's a lead). so maybe they left Jin out of the picture. lol sad.
DREAM BOYS is a musical. it was originally led by Takizawa Hideaki, but left to do other projects, so Kamenashi is lead. it's about boxing. the champion is usually led by a KANJANI8 member, like Subaru, & Kamenashi plays the challenger. it's a competition between the 2. complete with frilly outfits & songs~! 8)
from DB2006, Kame killed Subaru in the ring. LMAO. but i wonder how this one will be with Tegoshi.