Shiawase Nisetai Doukyou Keikaku: Yousei-san no Ohanashi

is a Japanese light novel series written by Yusaku Igarashi, with illustrations by Fly. The series began publication on November 10, 2016 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
We brothers and sisters who lost their homes for some reason and lived a survival life in the park decided to secretly move to a vacant house found in the neighborhood. But actually, there was a classmate girl living alone !?

"No way ... No way," Fairy-san "!?"

And for some reason, we were mistaken for "Fairy-san" by her. I ended up starting a strange living together while hiding.

Eventually, while living with her, I found out about her worries.

The heart-full story of a new "family" presented by Yusaku Igarashi has begun!