It is difficult to proceed with the game from the 4th round... Even if match the student's taste, stamina doesn't go up. Why?
Currently the only way to refresh your Stamina is by leveling up the Horny Level and you can do it twice from Lv1 > Lv2 > Lv3 in this demo.
Also take a look at how much Stamina you have left before doing certain skill since the day is over if you drain your Stamina entirely.
