>>720119920
If you care about lore, you might want to start with III first since V is sort of a sequel to that game, that and it will feel more impactful once you reach the Demifiend superboss. If you don't care, then sure, the story is still relatively self-contained and the gameplay is really good, just don't be afraid of playing on Hard since the game can get easy at times with how you can abuse weaknesses for extra moves.

Also, get a Mermaid.