since the last update was 4 years ago it looks like, i'm assuming that this is over and the game ended after Azula said she wouldn't train you anymore. Am I wrong? I hope i am.

Found a more recent version, still behind the Patreon, but non the less

https://apkhihe.com/four-elements-trainer/

download nekopoi mod apk is a website that hosts adult content, often featuring anime-inspired themes. It’s controversial due to its explicit nature and is primarily targeted towards a niche audience.

i found a site whoch seems to be official

Its fourelementstrainer.org Four Elements Trainer