I made sure I was able to catch a film in Tokyo when I went back, and I ended up seeing 20TH CENTURY BOYS: CHAPTER 2 - THE LAST HOPE, the second film of the planned trilogy directed by Yukihiko Tsutsumi. I saw the first film last September, which I rather enjoyed despite its flaws (read my review).
Set 15 years after the events in the first film, the protagonist of this film is the now-adult Kanna, played by Taira Airi, whose hairstyle in the film made me gape in awe.