Steamy Hot Springs: The Young Landlady’s Wet Secret Nectar (2005)

Machiko is the young proprietress of a hot spring inn, recently married into the family. She's constantly nagged by her sister-in-law, Satomi. One day, her ex-boyfriend, Katsuhiko, reappears. Machiko's passion is rekindled. However, a dark shadow constantly hangs over Katsuhiko. As the servant, Yosuke, investigates on Satomi's orders...