The Second Is a Christian (1985)

The story of beautiful Christian Nun, Kyoko (Shihomi) who is the object of affection for two very different men - one the happy-go-lucky Yakuza gangster, Haruhiko (Iwaki Kouchi) who is the next-in-line to takeover the ragtag "Tenryu Gumi" gang and the other bumbling Police Detective Kumashiro (Emoto Akira). The Tenryu Gumi is a collection of misfits and other troublemakers but are relatively peaceful due to their Christian beliefs. Their bitter rivals were the more traditional "Kuroiwa Gumi", a much more sadistic and violent group led by godfather Kuroiwa (Murota Hideo).