After our parents died in an accident, my sister and I were taken in by a distant relative. Technically, it's up to me to protect my younger sister Yui, but with no financial means, I can't even afford tuition, let alone rent. All I could do was feel ashamed of my own incompetence. Once I graduate from college and get a job, I'll make Yui happy without relying on anyone else. Until then, I decided to stay at the Koizumi household.
