Thank you so much for playing the game! I'm glad you love the vibes of it.
As for the introduction and/or cast, fortunately the characters are pretty consistent across the entire story. So eventually, during the stories of the second and third protagonists, you'll still see familiar faces. There will still be new characters of course, but you won't have to start over and get to know an entirely different cast, so high likely they'd be one-offs or side characters for plot reasons.