It was released as a single on December 26, 2023, by Sony Music Entertainment Japan, served as the theme for the seventh iteration of annual television special 18Fes.

A theme of "heartbeat", the song was written by Ayase and based on messages, essays, and video submissions from the program's 1,000 teenage participants.

[1][2] Shortly after the broadcast the day before, the song, titled "Heart Beat" was available for digital music and streaming platforms on December 26.

[5] Yoasobi gave the debut performance of "Heart Beat" at 18Fes on December 25, alongside band members and 1,000 selected teenagers.

[8] "Heart Beat" will feature at the duo's exhibition Semiconductors Create New Realities at Ginza Sony Park from January to March 2025.