Poorman, Ark, Billionaire

Seiya Shigaraki, high school student and daughter of a manga artist was thinking of quickly earning money by herself in order to support her mother.
Then, one day, while going to school with her chilhood friend Fuwa, Seiya feels like heaven and earth switch places; and is in the same movement thrown into another world.
There, after meeting the "Spirit of Chest" called Aurelia de Medici, Seiya becomes suddenly thrown in a battle revolving around money without first being given a chance to attack or defend...