Ten years ago, a mysterious black sphere appeared in the sky and destroyed the city below. Kagerou and Momiji were children when the destruction took place, growing up together into teenagers under this omin...

Meiji Aporo's just started attending Saint Richard Academy, a girls' boarding school. Unfortunately, Aporo's kind of a massive ditz... ...which annoys her roommate Chiroru to no end. Not one to be discoura...