The Army Reserve Corps (E03)

Ise Kaoru and Kahoru are twin brothers in the Japanese army's reserve corps. They awaken to discover that they've gotten cuter, as has their captain, Tatebayashi Kai. Despite this, they have to see their mission through. They join up with Yuma and head out on patrol around the city, where they run into an old enemy, Shigure. (Crunchyroll)