"A Child of Evil")[a] is the second track created by the Japanese singer Ai Higuchi [ja] for their fourth album "Saiaku Saiai" (最悪最愛, lit.

[3] The full version of the song would be released on 2 March 2022 as the second track of Ai Higuchi's fourth album Saiaku Saiai.

[2] From April to May 2022, Higuchi would perform the song again on a national tour in cities including Fukuoka, Hiroshima, Kanazawa, Kobe, Kyoto, Nagano, Nagoya, Tokyo, and Takamatsu.

[2] From 22 November to 24 December 2022, Higuchi would sing the song on a solo tour in the cities of Fukuoka, Nagano, Nagoya, and Osaka, before reaching the final location at Shinagawa Prince Hotel Club eX in Tokyo.

[5] Upon its initial release on 10 January 2022, the song would have a strong national and overseas appeal, reaching the top position on multiple music streaming service charts.