WeiB Kreuz or
Weiss Kreuz (White Cross) is about 4 guys who pose as flower shopkeepers or florists, but they're really assassins who hunt down after their target given to them by their boss. It's an interesting series, though I haven't finished watching it all. The main leader is the redhead name Aya and of course, they each have their own secret and personal backgrounds which they have to deal with. It's a fairly old series (1997?) and I believe the OVA is licensed, not the TV Series. The drawings are good and the story is kinda Sailormoon-ish, but a little more better. Here are some sites which I find very good:
The White Cross:
https://members.tripod.com/~thewhitecross/main.html
Weiß: Florists By Day, Assasins By Night:
https://www.angelfire.com/va/yume/weiss.html
I hope this helps and if you get a chance to see it, enjoy!