Zettai Tenshi Kurumi-chan

Zettai Tenshi Kurumi-chan(ぜったい天使くるみちゃん,lit. Kurumi the absolute angel) was a Female Japanese Virtual Youtuber

Introduction Video
This video was deleted, as were all her other videos.

Some users of 4chan's /jp/ had archived offline copies of her videos before they were suddenly deleted, and have made those available in a private MEGA share that is sometimes posted in Virtual Youtuber threads at that site.

Personality
Kurumi was an angel with red, fire-like hair who wore a black sailor suit.

When she uploaded the first video, she used a 2D avatar with FaceRig, later she made an original 3D avatar.

She usually spoke in a relaxing voice, but she became more active when playing games or singing.

Sometimes she broadcasted "surprise concerts" and sung powerfully, her singing voice received high praise.

She got along well with the professional Youtubers who debuted around that time.

”Sakayake tenshi to doutei daimao”(酒焼け天使と童貞大魔王; an Angel whose throat is burned by alcohol and virgin Satan) was a duo of Kurumi and Akkun-Daimao.

They, VT-212(Neets), and Inui Shinichiro also made a team of Virtual Youtubers, "Ten Ma Ki Nin"(天魔機忍; Angel, Satan, Machine, Ninja).

The February 14th incident
Note: the following information came from various sources, some anonymous, and has been partially translated from Japanese, therefore it may not be complete or accurate.

On February 14 2018, Kurumi's accounts (Twitter and YouTube) and their contents were suddenly deleted. Mirai Akari noticed as such and notified Akkun-Daimao. Kurumi claimed that her accounts had been taken over (unsure of the source of this claim).

The real-world identity of the person or people who created Kurumi, most importantly her voice actress, was (and still is) unknown. One individual identified as "kkk" claimed that the family of Kurumi's voice actress announced that this incident is related to a domestic problem affecting her, therefore it is difficult for her to restart her activities.

At the same time as "kkk" appeared, Akkun-Daimao received a message from Kurumi's family to not contact her.

From that message and a meeting with the rest of the "Ten Ma Ki Nin" group (except Kurumi) and Gorilla it was decided to wait for the incident to pass and to hope for Kurumi's return.

Trivia

 * Some of her videos are still available in private archives thanks to her fans