Rock band “A flood of circle” is in charge of the ending theme song for the new season of anime “Gunjō no Magmell”, which will be airing in April. The new ending theme song is called “The Key”. A flood of circle will also be releasing a new single which includes “The Key”.

The single consists of four songs with “The Key” being the main song. The single also includes the song “Backstreet Runners Ⅱ”. This is the sequel to the song “Backstreet Runners”, which will also be sold as a coupling song on their album that will be released on 6th March. There is also a cover of “Gunjou Biyori” (Ideal Days for Ultramarine) which was originally written by Tokyo Jihen, whom the band respect greatly. The final song on the single is “The Key- “Gunjō no Magmell version-”, which is a special version of “The Key” which they created for the anime ending theme song.