Ys Seven, the first three party member game iirc. Honestly it's quite good for having been an entirely new concept, and it's nice to see that the devs are willing to experiment. The story was good, I'd say about average for a Ys game, the gameplay was also, about average. Honestly probably not the best starting point if you have the option to choose between the games, my personal recommendation being Ys 8, unless you're looking for one of the other combat systems. Small side note, that throughout the whole game I didn't particularly have to grind or spend more time in an area then the story required me to, bar the final area, got caught on a road-block at the second to last boss and had to grind a bit to catch up. But besides that, it's quite a solid game.