At the request of Hanabishi Heavy Industries' Product Development Department, you've been asked to be a beta tester for a new maid product. Hand, oral, and vaginal service are supposed to be top-notch... but this is a test version. Problems are discovered one after another, and adjustments are made every day. Even so, your life with this cute, sexy maid who does whatever you ask is filled with happiness. But with the end of the test comes the time to say goodbye. What will happen to the two of you? A heartwarming love story...