Hello,
I'm about to publish the first route of my otome game. But I got a problem:
How do I reset the love points after a good or bad ending? Because I noticed that when I finish the route and want to restart the game, it starts with the last love points and not 0. 
I wanted to restart as 0 whenever I finish the route.
How can I do that?

You need to alter the flag back to the default value of the love points manually on the first scene. That's what I do with Cafe Rouge. You can also alter flags when you open/close a screen, and anywhere where you can alter a flag.

It's up to you how and where you want your flags to be reset, but you need to do it manually yourself. It won't reset by default.

I don't know how to alter the flag on the first screen. I couldn't find any documentation about it. TT_TT

Ok.. I got it!! Thank you for your help. I finally got how to do it.