"The one who pressed the switch, it wasn't me."
The story of a girl who has been accuseed of murdering her father.
- Original: The original version of the song uploaded to niconico on December 4, 2012, and later featured on EXIT TUNES PRESENTS VOCALOID™3 Library MAYU SPECIAL 2CD and The Muzzle of Nemesis.
- Instrumental: An instrumental of the original linked from its niconico upload.
- The PV was illustrated by you-ring.
- The character in the video appears identical to MAYU's VOCALOID3 module.
- Red and blue symbolism contrasting each other is used throughout the video.
- The PV text has references to characters from the Original Sin Story series.
- The lyrics page in The Muzzle of Nemesis indicates that the song takes place in BT 1013.
- The niconico upload is described as "Her condition is severe."