"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? (Source: Variety, edited)

Maigahara Senior High School is a prestigious institution renowned for producing many talented musicians over the years. True to the school's reputation, an intriguing rumor is widespread among its students: whosoever provides a spectacular performance at the upcoming festival will receive extra credits. Serina Akesaka is an outgoing first-year student on the verge of failing her classes. After recalling the circulating rumor, Serina decides to recruit four students—Nazuna Tennouzu, Aliciana Ogata, Hakobe Naru, and Nagi Kobotoke—to form a band with her. As these five passionate girls start their journey together, the music they will soon produce is bound to touch everyone's hearts and leave an everlasting impact.

The anime will take place 10 years after FLCL Alternative and will center on a high school boy and girl.