When I Was Six Years Old, I Made My Sisters the Strongest in the World.

I was reborn, but in the body of a six-year-old kid. When I was depressed, I awakened the most powerful exchange system. As long as I get my sister's favor, I can exchange various items and draw prizes. From then on, I determined to help my four sisters become the strongest in the world. One day, war broke out in the empire, and the four sisters turned the tide, saved the people of the empire from fire and water, and pushed me to the throne. I really don't want to be a king, I just want my sisters to be happy. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.