The main plotline concerns retired Mr Ueno, who since a child has been cared for by his late parents’ robot maid ‘Maria’ – a lifelike humanoid in a maid’s outfit! Over the years, Ueno has developed an unconsummated love for Maria, but although she has not ‘aged’ as such, she is now classed as an obsolete model and Ueno is finding it difficult replacing her fading battery… The secondary plotline involves Detective Yuri Akagi, who is investigating a series of rapes, which she believes may be being committed by a rogue droid.

Once again, Lady Ninja Kasumi is a candidate for a dangerous mission that will use all of her abilities as both a kunoichi and a woman. Her clan elder approaches a specific former member of their group, Sakichi, for his aid in the matter. Unfortunately, due to a tragedy and a lost love, he is unwilling to lend his help to the Sanada ninja, and Kasumi volunteers to handle the matter. Ultimately, she is captured and it is up to Sakichi to help her get to safety... but not before she settles the score with a rival lady ninja.