Koi wa Futago de Warikirenai

is a Japanese light novel series written by Takamura Shion, with illustrations by Arumikku. The series began publication on May 10, 2021 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
My family moved next to the Jinguji family when I was six years old. From then until the present of the first year of high school, both parents were on good terms, and the twin sisters there were close friends who grew up together as if they were a family.

Ryumi, a boyish and maiden sister, and Naori, a sub-car ota's younger sister who has a cute nature on the outside. And I'm Jun Shirasaki, who isn't afraid to be sandwiched between beautiful sisters with personality contrasts. Even though I had a budding love for some time, I didn't have a specific relationship and the exchange continued.

"Why don't you go out with me? How about trying it out?"

--This word from Ryumi eventually led us to a strange love triangle.

First love twisting twin love comedy opening!

Manga
A manga adaptation of the light novel was serialised in Dengeki Daiouji and released under the Dengeki Comics NEXT imprint from 2022.
 * see: Koi wa Futago de Warikirenai (Manga)