Help, why does my relationship level reset to 20?
Here:
Dev has concluded that gaining relationship points was too easy, so he locked progress when reaching 20 and 40 (for now, will be also for 60 and 80) behind a certain interaction. With the update, if your rel level was higher than 20, he forced it to be reset to 20 so you can experience those events.
When you start the night, you have an option to give Yuna something, there's also an option to chat with her, this is a hunting system where she'll point you, what must be done in order to progress further with relationship
Cheers