Arukasa continues to serve as a kunoichi under Tokuta, and is faced with the dilemma poses when the shogunate passes the "Plight of the Virgins" law that requires her to prove her own purity. It'll be tough, especially after she gets assaulted by some yokai and the crew of the Black Ships.
Silly as always, Ero Ninja Scrolls continues to not worry about trivial matters like character development and plot, but instead creates innovative new circumstances for Arukasa to navigate. Art is nice as always, and really the main selling point for the series.