START-535 Haru Shibasaki takes on the challenge of infiltrating a men's-only sauna! She endures the shame, her flat chest trembling, but is discovered to be a woman and gets tricked.

"We're going to have Haru Shibasaki infiltrate a men's-only sauna! If she doesn't get caught, she'll get a 100,000 yen travel voucher and a vacation!" Swept away by the producer's persuasive words and enthusiasm, she reluctantly went in! She changed clothes in the locker room! She washed herself next to the customers and experienced the sauna! Haru-chan is boyish, but her body is so sexy that she was immediately found out! She got fucked in the bath, in the sauna, and in the locker room!