Artist, mangaka.
Japanese name: 一概 (reading is given as Ichigai)
Name used as a signature: ICHIGAIN
Old name: やまだ一概 (Yamada Ichigai)
Circle & site name: イヤリング爆弾工場 (イヤリングボムファクトリー, EARRINGS BOM FACTORY)
https://www.pixiv.net/users/1077232
https://www.pixiv.net/stacc/ichigain
https://twitter.com/ICHIGAIN_CM
https://twitter.com/ichigain880
https://twitter.com/intent/user?user_id=1283872068115656704
https://twitter.com/intent/user?user_id=238886711
https://ichigainbom.booth.pm
https://nijie.info/members.php?id=45270
https://pawoo.net/@ichigain880
https://pawoo.net/web/accounts/187661
https://sketch.pixiv.net/@ichigain
https://skeb.jp/@ichigain880
https://ask.fm/ichigain880
http://privatter.net/u/ichigain880
http://www.dlsite.com/ecchi-eng/circle/profile/=/maker_id/RG32073.html
http://www.dlsite.com/maniax/circle/profile/=/maker_id/RG32073.html
https://www.melonbooks.co.jp/circle/index.php?circle_id=29027
http://8803net.wixsite.com/gallery
https://8803net.wixsite.com/gallery
https://www.pixiv.net/stacc/hayawossan
https://sketch.pixiv.net/@hayawossan
https://icgbox.tumblr.com
https://leonabom.tumblr.com
http://p.twipple.jp/user/ichigain880
http://twitpic.com/photos/ichigain880
http://twitpic.com/photos/ichigay880
http://yfrog.com/user/ichigain880/photos
