/jp/ - Otaku Culture

>>18472415
>>18472675
>>18472805
In Sengoku period there were Four Heavenly Kings 龍造寺四天王, but different history documents listed different combinations of members, so when they talk about 龍造寺四天王 they have to list all five people.

And in the case of Vtubers, Siro was not included at first. (you can find Siro's reply down there)
https://twitter.com/q_d__b_p/status/943477296203055104
Then some goes for Boss+4, some goes for 4 (5) but the latter is not uncommon. The video that introduced the Four Heavenly Kings to Niconico actually included Ai-chan.
http://www.nicovideo.jp/watch/sm32457652

Even in Sora's ranking video >>18473187 the guy said "As expected, the five people that are called Four Heavenly Kings were strong". You can also search バーチャルYoutuber四天王 on twitter to see for yourself.