Android-girl Mahoro has saved the humanity in the war with the powerful enemy countless times. But then came the day when Mahoro’s resources were almost exhausted. On conditions that she will not participate in battles, she will be able to operate 398 more days. How will she spend this time? Mahoro stars working as a maid in the young Suguru’s house. She wants to get a taste of life away from battlefield. The young orphan Suguru has no idea about Mahoro’s past and those invisible ties that forced her to choose him.