Our brothers and sisters, whose parents died in an accident, were taken over by a distant relative's house. Actually, I have to protect my sister Yui somehow, but I can't pay the rent, let alone the tuition, because I don't have the financial power. I could only be ashamed of my awkwardness. After graduating from college and getting a job, I will make Yui happy without the help of others. Until then, I decided to take care of this Koizumi family.