Taichi is deeply hooked on visiting brothels and invites his friend Ataru to a soapland. They arrive during a special 4P campaign, making the price incredibly cheap, much to Taichi's delight. However, unexpectedly, the two women who appear before them are their own mothers. Stunned and speechless, the boys watch as their mothers transform into foam princesses, overwhelming them with exquisite soap techniques. Gradually, they lose themselves completely, falling under their spell.