Event planner Yuka Sawatani‘s life ended as the result of overwork. Reborn into an Otome game with her memory intact, she becomes the villainess Elizabeth. She tries to resist her fate, but at the ending of the game, she is promptly banished.

In this world, when human beings reach the age of 12, their bodies gradually change to the genders they wish to be. And by the time they are 14 years old, their appearances change to reflect their genders. But by spring of my eighteenth year, I am still without a gender...

A war rages through the city, where battles are fought with music. Theo is disappointed by his brother Will's refusal to take part in the war, despite his talent for composing battle music, and decides to take matters into his own hands by using the music Will has composed.

After being accepted by the Melite Conservatory of Music, Taki Ren, travels all the way to the City of Music, Vienna, to fulfill her dream of becoming a composer. However, there's one problem: Melite is an all-boy's school! Her classmates are all musical geniuses, but they also come with problems!