A flat-chested girl discovered at a hot spring inn! Want to try entering the men's bath wearing only a towel? HSODA-122

A flat-chested girl discovered at a hot spring inn, determined to win a large reward, ventures into the men's bath wearing only a towel, embarking on a "Flat-Chested Adventure"!! She brazenly disguises herself as a man, making no attempt to conceal her breasts, letting her flat chest be fully exposed as she raids the men's bath!! The more difficult and erotic the task, the higher the reward!! Will she be able to avoid being approached by male guests without being discovered!? She secretly masturbates men to avoid being seen by other male guests! She even secretly performs oral sex!? She even challenges herself with the most difficult "flat-chested sex"... but gets discovered!? Faced with an excited group of male guests, the flat-chested girl also becomes incredibly excited!? Then she goes all out, engaging in erotic orgy with everyone, successfully completing the "collection of a large amount of semen" and winning the large reward!?