It's a song I want to convey to people who are working hard in this era, with the life of the main character of the drama, and in this era, various things are happening...On September 27, 2021, Ai announced on her social media of a song she recorded for an upcoming NHK TV series.

[7] Eri Fukatsu also commented she was wary of Ai's recording but stated, "My heart was shaken, robbed and filled.

[8] To promote "Aldebaran", Ai was to appear on NHK's Utacon to preview the song on September 28, 2021, however the event was cancelled and moved to October 4 due to an emergency deceleration.

[9][10][11] Universal Japan issued a compilation chapter titled Self Selection "Piano Ballad" on the same day the single was announced.

In March 2022, "Aldebaran" peaked at number 12 on the Billboard Japan Top User Generated Songs chart.

[22] Ai performed "Aldebaran" on the day of its release during her 20th anniversary tour It's All Me at the Tokyo International Forum Hall.

[23] Ai performed "Aldebaran" at the 72nd NHK Kōhaku Uta Gassen on December 31, her fourth appearance on the show.