Seikon no Qwaser II (The Qwaser of Stigmata II)
Sasha is partnered with Hana as his new Maria. They infiltrate an all-girls academy, forcing Sasha to crossdress, in search of a Qwaser-related artifact called the Magdalena of Thunder which has appeared in one of the students. However, they have some competition in their search of it.
[Source: Anime News Network]