>OVA is 2 episodes long
>LN doesn't even last a year
Author thought Kurenai was better so he just wrote three novels of Denpa Onna and then called it a day, even though there's no closure whatsoever.
Author hated the material.
Denpa was just a side project the author made as a joke.
What. You mean Denpa Teki.
Not that I don't like the Kurenai anime, but Denpa Teki was so much better.
Kurenai manga was pretty fucking great though.