Yamikumo Kerin

Yamikumo Kerin (Japanese: ヤミクモケリン) is a male Japanese virtual YouTuber who began his activities in February 2018. He was a member of the VTuber group BANs and was affiliated with the upd8 project. He is known for his comedic videos about a dark elf living in an elven village in Gunma Prefecture, and for his web series Koko wa, Shinrin Kaitaku Honbu! ~Yousei no Genkai Shuuraku~.

Profile

Item	Detail
Debut	February 2018
Birthday	October 12 (character setting)
Age	19 (character setting)
Species	Dark elf (character setting)
Height	180 cm (character setting)
Affiliation	upd8 (formerly independent)
Group	BANs (former member)
Language	Japanese
X account	@Kerin_Vtuber

Career

Yamikumo Kerin's YouTube channel became active in February 2018, during the period when the number of virtual YouTubers grew quickly after the concept was popularized by Kizuna AI. He started out as an independent creator and later joined upd8, a support project for virtual YouTubers, which also sold official merchandise of him, including wooden straps and large acrylic key chains. He was also a member of BANs, a group of unconventional VTubers.

In February 2025, he marked his seventh anniversary with a new episode of his main series and a related celebration stream. He has continued to release videos and livestreams on his channel regularly.

Activities

Streaming style

Kerin's content mixes scripted comedy videos with livestreams. His best-known work is the web series Koko wa, Shinrin Kaitaku Honbu! ~Yousei no Genkai Shuuraku~, a comedy built around his life as an elf in a small, struggling rural village. His videos often feature Iwanaga, the COO of NIJISANJI, and Domyoji Haruto of Game Club as recurring figures. His livestreams include casual chat streams, such as a news-commentary format he presents himself, along with game streams like pinball and streams about browsing the internet.

Music and works

Koko wa, Shinrin Kaitaku Honbu! ~Yousei no Genkai Shuuraku~ (web series)
Official upd8 merchandise, including a wooden strap and a large acrylic key chain

Characteristics

In his character setting, Kerin is a 19-year-old dark elf who lives in an elven village in a virtual version of Gunma Prefecture and also works as a janitor at a factory in a nearby town. He has dark skin, black hair, brown eyes and pointed ears. His hobby is building missiles and firing them at various places, most often the offices of the video site Nico Nico Douga. He studies dark magic, especially explosion magic. His catchphrase, "buchitobashite iku ze!" (roughly "I'll blow you to smithereens!"), is often shortened to "buchitoba". His videos also make a running joke of how much he admires Elu, a virtual liver from NIJISANJI.