i missed the start of it, but for one reason or another this middle aged guy (with glasses i think) is involved with the yakuza. he's sitting in a locker room with another yakuza guy and he finds a shotgun in a locker and shoots him.
later on theres like a yakuza ballroom/dinner type event and he walks up to the bosses (?) daughter and kisses her and walks off, with everyone staring at him while she does a little dance.
towards the end he locks himself in his apartment and on TV he finds out that he is surrounded by swat (maybe he took hostages or something, i cant remember) so he tries to write a suicide or a sorry note to his wife. the swat team tries to storm his apartment but they have visions of demons following him and he kills them and walks out (i think he also takes a hostage)
my memory is a bit fuzzy on the movie, but i think i summed up the major events of what happened in it. muchas gracias to anyone who can ID it for me.