Ken will be featured in a duet cover song of Teshima Aoi's upcoming movie music covers album Cheek to Cheek ~I Love Cinemas~ that will be released on 19th Dec
For Ken's case , he will sing Cheek to Cheek together with Teshima and their duet cover song will be included as a bonus track in Cheek to Cheek ~I Love Cinemas~
Teshima provided backing vocals for last year's B-side of Ken ie. Ho-Tsu so I guess this time round Ken decided to repay back the favour to her
https://www.barks.jp/news/?id=1000161782