START-535 Haru Shibasaki takes on an undercover challenge in a men-only sauna! She trembles with embarrassment as she tries to keep her flat chest hidden, but her identity is exposed and she ends up getting caught in a compromising situation

Shibasaki Haru-chan is asked to go undercover in a men’s sauna! If she isn’t discovered, she’ll receive a 100,000 yen travel voucher and paid time off! Swept up by the offer and the producer’s momentum, she reluctantly goes in. She changes clothes in the changing room, washes up beside other guests, and experiences the sauna. Haru-chan has a boyish look, but her figure is so striking that she is quickly found out. In the bath, in the sauna, and in the changing room, she gets caught up in the situation!