Ramune has a marble in the neck, you have to tilt it right to drink it properly. In Yuudachi's case she tilted it too much and marble is blocking opening. Take a look at second paragraph of wiki article (https://en.wikipedia.org/wiki/Ramune ).
Ramune has a marble in the neck, you have to tilt it right to drink it properly. In Yuudachi's case she has bottle rotated wrong way (It has bumps to stop marble rolling on one side) so the marble rolled down and blocked the opening.
Yup, that's what I thought for Yuudachi but in Samidare's case? Did she drink it too fast?
