Anyone into the River City Ransom series?

Lately, I saw someone on Twitch playing these Kunio-Kun games, which is the Japanese version of River City Ransom, and holy smokes, there are a BUNCH of these games, even sports ones, that tie into the story/series.   Personally, I've only played River City Ransom for NES and River City Ransom: Underground & River City Girls on PC.  River City Girls Zero is coming out soon, which is a prequel to River City Girls.  But after seeing all these other games, I wanna get into them now.