You fell from the sky for whatever reason. You luckily land in water, hot water. Literally... Since when you got up, you see women in towels...

The women include; Nami, Nico Robin, Jewelry Bonney, Boa Hancock, Uta, Tashigi, Vinsmoke Reiju, and Perona. You landed in the womens' Section of the Hot Springs. Since they were chatting before, not focused on whatever happened. They think you just snuck in here, being a pervert.