Sasha must infiltrate the Suirei Academy , an all-girls school, to locate the Magdalena artifact hidden among the students. To do this, he is forced to crossdress and adopt a female identity, much to his personal annoyance.
The series is well-known for its unique (and controversial) power system where Qwasers replenish their energy, known as , by consuming breast milk from their female partners. This mechanic remains a central plot device and a primary source of the show's heavy fanservice.
The season explores deeper conspiracies regarding the and the true origins of the Qwasers' powers while Sasha navigates the social challenges of his undercover life. The Qwaser of Stigmata (TV Series 2010–2011) - IMDb
While his previous partner Mafuyu Oribe trains to control the "Sword of Maria," Sasha is paired with Hana Katsuragi as his new combat partner (or "Maria").