The Student Government has decided to make a dunk tank. They recently got some parent donations and were told it'll only cost ¥1300, but then they learned that that was the delivery fee, and it'll actually cost ¥4000 for the whole thing.

Pricing scheme is approximately ¥30 to ¥50 for 3 balls, throwing it from closer will cost more. If you hit the target, the person in the dunk tank will fall into the tank and be drenched in water.

This will use the amount in vouchers they earn. They have a scheme where you need to pay for vouchers beforehand and you can use them on-site.