It's Azumanga Daioh, but with X-Files. So it's Pani Poni Dash?
Kagegami High (影神私立高等学校) is a private girls-only school on a small island off the coast of Tokyo. It is a place for learning, menacing government agencies, strange religious practices from the dawn of Japanese history, and moral and physical development, all in a secluded location, free from wicked outside influences. It’s supposed to be a very good, very elite school. You remember hearing that somewhere, though you’re not sure where. You got in, though you’re not sure when you applied, how you passed the entrance exam, how your family is paying for it, or how exactly you got here. There are a lot of things you’re not sure about, but is that really so different from before?