Pop duo ON/OFF has just announced that they will be releasing their first single of 2011!

The single is titled "Hajimaru no wa, Sayonara", and is set to hit stores on April 27th. The single comes in two varieties: a limited 'CD+DVD' version and a regular 'CD-only' version. The limited edition of "Hajimaru no wa, Sayonara" comes with the music videos and off-shots for both tracks, a 32-page photo booklet, and one of four exclusive jackets for the single.

The lead track from the single will also become the opening theme to the popular anime,�"Beezlebub".

Check out the track lists for both versions of the single below!

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< Limited Edition CD Track List >
01. Hajimaru no wa, Sayonara
02. Kimi ga Inakerya
03. Hajimaru no wa, Sayonara Instrumental
04. Kimi ga Inakerya Instrumental

< Regular Edition CD Track List >
01. Hajimaru no wa, Sayonara
02.�Kimi ga Inakerya
03. Hajimaru no wa, Sayonara TV Size Ver.
04. Hajimaru no wa, Sayonara Instrumental
05.�Kimi ga Inakerya Instrumental

Source: ON/OFF's Official Website