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|Single by Eiko Shimamiya|
|B-side||"To lose in amber -I'VE in BUDOKAN live ver.-"|
|Released||June 21, 2012|
|Eiko Shimamiya singles chronology|
"Onkalo" is a maxi single released by the J-pop singer Eiko Shimamiya (ETB-0161). Released 21 June 2012, it is her first single after her retirement from I've Sound in April 2011. The single features two new songs; Onkalo and Unison.
- "Onkalo"（Instrumental version）
- "discography｜島みやえい子 オフィシャルウェブサイト Eiko Caffe". Eiko-shimamiya.com. Retrieved 2017-03-05.