It's been a month since I got a little sister. The website where I found her is a special place where runaway girls gather. Created with various tactics to find NEET girls, this site offers a one-month trial period during which housing, food, and allowance are provided. The amount of the allowance reflects her suitability as a little sister—and just as much as I'm choosing them, they're also choosing me. I fell for Rumi the moment I saw her true face and realized her real nature...