10 mothers in a bath, 360 minutes and 2 pieces.

Parents and children's affair that is carried out in the hidden hot water between mountains. A parent and child are in an open-air bath or a corridor, and another parent and child may come at a dressing room. Even though the scenery is a little different from everyday life, it contains 10 sets of hot spring inbreedings that parents and children ask for each other as usual.