you need to make a potion if i remember well
You need to be saturday evening at the onsen
you can just press H to hide everything, go to the option and help menu to see more
just go to girls at the top right and go on the caracter you wanna progress
Go to your room then hints and then how to regain magical power
click on girls at the right top and you have the detail about what you have to do.Make sure to have the most recent version too
