>>8687647>>8687516I'd get 0 and Kiwami 1+2 first. Start with 0. Don't marathon the series, take a few weeks before you start with K1 after finishing 0. The series is on sale often, so don't worry about missing out on a deal.
Probably my favorite gaming series to play right now. Playing it on the weekends while sipping on whiskey/soda highballs is just pure bloss.