I do know there is a little meter at the top off the screen that is suppose to fill up when you drink sake to the point where the game says you're drunk. Frankly since I unlocked our drinking buddy oni, I never actually seen that meter fill up no matter how much sake I have downed. At all. I'll down all 5 drinks in my current container size and never see a single change.

Is it disabled? What does the meter do when it is filled up besides what I assume to say I can' drink anymore.

thats because we are freaking immune to alcohol haha ^^v .
or is it because our character is underage and is not allowed by the government to be drunk. you dont know when your character run by itself and take off it's clothes. now that would be fun hahaha. nah, I'm just kidding ^^v peace