After I posted on ヲタ芸[otagei], I found something was missing. Yes, I forgot to write about this term, 地下アイドル[chika aidoru], so I shall add it now. Well, you could guess what this means. 地下[chika] means underground, and アイドル[aidoru] means idol. So literally it means an underground idol.
If you happen to be in Tokyo, just go to the main street in Akihabara on weekend. If you are lucky, you could see such girls or a lot of ヲタ芸師[otageishi]. At any rate, such idols have not made a debut, but they sing or do a photo session. So that’s why they show up on the street to sing to get more popular. Such girls are what’s called, 地下アイドル(or else ライブアイドル[live idol]). They might show up on the stage of such a tiny clubhouse. And yes, of course otageishi would love such 地下アイドル that they come to tiny events and do otagei or take pictures just like paparazzi…If a 地下アイドル shows up in Akihabara only(or mostly), she might be also called アキバ系アイドル[akiba-kei idol]. Having said that, AKB48 is アキバ系アイドル too although they made a debut. In general, most people seem to put these two kind of idols into the same pot, but technically it’s wrong. Of course, they never forget to introduce themselves on the net. Mostly, they do it on mixi. One more thing, if an idol appears on her site mostly, she might be called like ネットアイドル[net idol]. I am not sure they are really popular among akibakeis.
photo credit by Windbell