New Game+

[galadain]

Is it possible to do a new game+ mode?

I'd like to have the player chose an NPC to work on and max out their relationship throughout one play through. Once they finish, they would save then start over with a new game and play through to work on a different character.

[Silken Sail]

Yep! The technical side of this is actually really straightforward, you just need to set some persistent variables, first by setting the default value then setting the value to whatever you want when you need it to change: https://www.renpy.org/doc/html/persistent.html

In your case, I'd set one for them completing the game for the first time, and then one for each character reaching their "max" relationship. Then you'll want an if/elif check at the start of the game to change things accordingly.

As with many things in RenPy, the tough part isn't the technical aspect, but rather the follow through. Changing things drastically on each playthrough can be a lot of work, so make sure you've planned things out thoroughly with flowcharts and outlines before you start writing. Good luck!