Uzagarami Gal no Isourou ga Ore no Heya Kara Deteikanai.

is a Japanese light novel series written by Hideaki Mashiroya, with illustrations by Yuki Saki. The series began publication on February 10, 2021 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Would you be envious if you had a cute cousin? I don't think so.

Manami Yoshida, a cousin who lives in our house, is a beautiful girl with a personality that is easy to get along with, contrary to her gal-like appearance.

But there is a big problem. That is-

"Hey, Haru-chan. Let's play fighting games. Fighting games."

"No. I'm going to study. "

"I thought my cute cousin would play with me. I'm sorry."

Always entwined. Is too ugly! If you are studying, you can put your palm on your side, and after taking a bath, you can wander around the living room with a bath towel.

――Isn't there a place where I can relax?

But she's always joyful, and when she plays games with her, she smiles innocently ...

The gal-type sister who has rolled in is a beautiful girl, but even without it, it may be a small devil that disturbs my peaceful daily life.