Diabolos-Chan_Again
Some woman named Lauren lives in a world where Rhythm is integral to life. However, Rhythm is mysteriously disappearing, so she, her brother, and five extra bozos go together to stop whatever is removing the rhythm. Also, one of these five bozos, Aka-Chan, is trying to figure out where the hell she comes from. Not in the sense where babies come from, but in the sense where she specifically comes from.
WARNING: There WILL be Yaoi.
Partially inspired by "How did I get here?" by @YourBeginnerAnimator