The secret to being popular with women lies in the act known as reverse soap. Airi is captivated by Soap-kun's attentive performance, completely enchanted and melting into pleasure. The play on the sex chair and on the mat becomes even more exciting than before, making her tremble with ecstasy. As she submerges her body with a splash into the bath, Soap-kun's tongue envelops Airi's lower body... This is the moment where both mind and body are simultaneously liberated.