Ore no Kaachan ga 17-sai ni Natta

is a Japanese light novel series written by Ryu Hirosaki, with illustrations by Parsley. The series began publication on July 10, 2013 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Takashi Sawamura, a second year high school student. One day when I got home from school, there was a strange high school girl!

"Takashi, welcome back", no way my mom !?

In order to find out what happened, I decided to follow mom with my withdrawal sister, Yuka. Apparently, if you enter the rumored "17-year-old religion" in the streets, you can become "forever 17-year-old" ...

A heart-full sitcom by a 17-year-old mother!