The film stars Eiji Wentz (Brave Story) as the hero, Natsuna Watanabe (Gantz, Kimi ni Todoke) as the heroine, Ruriko and Show Aikawa (Zebraman) as Mister X. Here's a little more information on the film and its story, thanks to Anime News Network:
"Tiger Mask" is the alter ego of the character Naoto Date, a pro wrestler who goes against an evil wrestling organization and fights for children in an orphanage. In the new setup for the film, Date dons a special suit and "transforms" into Tiger Mask with enhanced mobility and muscle strength. His mask has also been redesigned with a nod to American comic action heroes such as Spider-Man and Batman.