The Strawberries and the Gun(2007)

Older brother Kenichi and younger brother Takashi had not seen each other for a while, but they meet at their estranged father's funeral. The father had moved to a small town and remarried and has a daughter, who is supposed to be their half-sister. Her whereabouts are unknown, as she left home at a very young age. One of the brothers mistakenly meets her, under very strange and disturbing circumstances...