Uchi no Onee-chan ga Saikyou no Binbougami na no wa Mondai Darou ka?

is a Japanese light novel series written by Kashima Usagi, with illustrations by Kayahara. The series began publication on January 10, 2018 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
If you are extremely poor, you will be the strongest in the world!

I'm Kamiharu Shien. He is a very poor man at school. The reason for poverty is that Fukuno, the poor god of self-proclaimed "my sister", is possessed. Fukuno is cute, but when it comes to violence, it's scary enough to leak. Seriously ...

One day, I met twin beautiful sisters, but they got caught up in a bad incident ...

I don't know. Hey Fukuno, would you like to help them?