That couple sure boozed up. From the previous 4koma, never knew Gran Class had unlimited drinks. I think Mizuki also had posted it on his twitter long ago.
Whoa, this is awesome!Beverages are all-you-can-drink, it says!That's amazing, all right.Hold on, Sis. Don't drink too much just because it's all-you-can-drink.I'll be fine, I'll be fine.My stomach hurts...