Koronba (ころんば) was a Japanese music producer active in the Internet from 2008 to 2016. They started making music in Nico Nico Douga using UTAU and released songs until 2013. Among these, four songs stood out, which gained a collective Fan Nickname of Kaisen Ichiba (海鮮市場; Seafood Market), as each of them pertain to a specific aquatic animal.
Throughout their presence, Koronba warned others not to promote their works (including their songs) and not to attribute them to any videos that used their songs, which means people had to censor their name to things like こ○○ば (Koxxxba). Despite these requests, they eventually deleted their Nico Nico Douga channel in 2014.
Koronba made their own UTAU voicebank in 2010, called Koronba 4gou (ころんば4号), which they used in every song in Kaisen Ichiba. They removed the voicebank's download channel in 2016, shortly before they retired from the Internet.
By March 2016, Koronba's mental health had deteriorated so much that they became suicidal and thus had to retire from the Internet. Many of their social media accounts were deleted as a result.
Koronba's spirit had not been lost on other Internet users though, as many songs reminiscent of Kaisen Ichiba have been made. The community that make these songs is called Subeana Kaiwai (すべあな界隈; "kaiwai" means "community")note , and producers in the community include x0o0x_. Kaisen Ichiba is also a popular subject of OTOMads (the Japanese equivalent of YTPMVs).
Apart from songs, Koronba also made other works, including a game AQUOR and a comic series Shirei Man Reddo (死霊マンレッド; Soulman Red).
- 2011: "untitled_0360"
- 2011: "untitled_0346"
- 2012: "untitled_0404"
- 2012: "Kuromaguro ga Tonde Kuru" ("クロマグロがとんでくる"; "The (Pacific Bluefin) Tuna Comes Flying")
- 2012: "Iwashi ga Tsuchi kara Haete Kurunda" ("イワシがつちからはえてくるんだ"; "The Sardines Come Out from the Soil'')
- 2013: "Yatsume Ana" ("ヤツメ穴"; ''Lamprey Hole")
- 2013: "."
Koronba's music provides examples of:
- Attack of the 50-Foot Whatever: Downplayed. In ".", jellyfishes the size of a human fly above utility poles.
- Creepy Cave: In "Yatsume Ana", the first singer (Koronba 4gou) goes into a cave and has their finger cut off by putting it into a hole, and they later melt after falling inside that hole.
- Fiendish Fish: In "Kuromaguro ga Tonde Kuru", the singer (Koronba 4gou) is killed by flying bluefin tuna and the spikes of yellowfin tuna.
- Flying Seafood Special:
- In "Kuromaguro ga Tonde Kuru", bluefin tuna and yellowfin tuna are shown to fly and can even target people.
- In "Iwashi ga Tsuchi kara Haete Kurunda", sardines can fly from the soil (from which the song is named).
- In ".", giant jellyfish can fly above utility poles. They use this to eat their prey.
- Lucky Charms Title: The fourth and last song in the Kaisen Ichiba is ".", and no actual pronunciation is given for this. Some fans call it "Jellyfish" ("クラゲ") instead.
- Tentacled Terror: In ".", jellyfish the size of a human are described to be able to suck people's brains and eat them. Normal jellyfish can grow up to 40 cm (16 in).
