"Housing Complex C" centers around Kimi, who lives in a small, low-cost housing complex located in the seaside town of Kurosaki. Trouble seems to follow her wherever she goes, and horrific incidents begin to occur. Is an ancient evil stalking the residents of Housing Complex C?

Chika Takami, a self-proclaimed normal girl, has never been involved in any clubs and lacked any notable talents. However, after a visit to Tokyo, she discovers a stage where even an ordinary girl like her could shine—the world of school idols. Inspired by the former superstar school idol group μ's, Chika is determined to start her own school idol club in her seaside hometown at Uranohoshi Girl's High School. But even before gathering any students to join the group, the aspiring school idol finds her greatest obstacle to be student council president Dia Kurosawa who stands firmly against the creation of the club. Just when it seems there is no hope, Chika meets Riko Sakurauchi, a transfer student from Otonokizaka High School, home of μ's. Somewhat shy but a talented piano player, Chika believes her to be a promising recruit, though convincing her to join is easier said than done. In spite of that, Chika chooses to charge forward and overcome the obstacles keeping her from forming a school idol group that shines as bright as the nine that came before her. [Written by MAL Rewrite]

Short centering on a "Lost Room" where you can find what was lost—or those who lost. This room, which belongs to no one, lies forgotten in a corner of Chaldea. (Source: ANN)

Episodes 12–17 of Dies Irae released exclusively on the web.