Title: VTuberなんだが配信切り忘れたら伝説になってた | VTuber Nandaga Haishin Kiri Wasuretara Densetsu ni Natteta | I’m a VTuber but I Forgot To Stop the Stream and Became a Legend
Publisher: Fantasia Bunko (Kadokawa) | Series page
Bookwalker Series Page
Author: 七斗 七 | Nana Nanato | Twitter account closed
Illustrator: 塩かずのこ | Siokazunoko | Pixiv | Twitter
Wikipedia (JP)

Initially a WN (with new chapters still posting as of yesterday), Fantasia Bunko has two volumes out and a third in pre-order.