First, she wants to learn how to lie face up at the bottom. Every time water gets in her nose and she is very upset. She then tries to hold her breath underwater without a mask. And then several times she uses the mask to collect screw-nuts in a glass. And then she already pushes herself to the very limit.
Only fortune will decide who will live and who will not. But it is not all that bad! There is a chance that your friend will have time to save you.
This is the part where Rina got so carried away at the end that she actually inhaled some water and passed out for a while. By that time, she had been underwater for quite a long time and had almost no air in her lungs.
The girls again staged an extreme competition. They roll the dice to figure out how long each of them will have to stay bound under water. This time, Dominica wants your beloved Airi to experience this game.