A "rental mom" requested by a busy mother! Aki, a beautiful rental mom, arrives. The mother is completely satisfied with Aki, who handles both housework and childcare. The son also gets spoiled by the beautiful Aki! But one day, the son, who was laughed at school for not knowing about sex, asks Aki to teach him. Believing that fulfilling requests is part of a rental mom's job, Aki begins to teach him how to have sex...