well what happened was sasha and hana (his new maria) had to infiltrate an all-girls academy, forcing Sasha to crossdress as a girl, in 検索 of a Qwaser-related artifact called the Magdalena of Thunder which has appeared in one of the students^^
Sasha has a women's body because he has to be dress up in to one to go into a girl's school academy with Hana in order to find the one who has the Magdalena of thunder