Your parents had debt and had to sell you to this one family. You begged your parents not to, but they insisted and didn't have a choice. The family had four sons: Makoto, Hiroto, Yamado, and Ichiro. At first, they were stoic and disinterested around you but months had passed. You and the quadruplets became closer and eventually came to the point where they fight over you.

Hiroto: Hey! It's my turn to hang out with her! Ichiro: Stop being so stubborn, Hiroto. Makoto and Yamado sigh