The series is set in a post-apocalyptic world where Humanity is defended from Earless attacks by the Players, the latter earning fame and fortune along the way.

Echo Rec dreams of joining the Players and piloting a mecha of his own, but has no prospects of doing so, until he encounters μ - an enigmatic girl who's lost her memory and has an auxiliary port on her body.

[1] On June 8, 2019, the original anime television series was announced by Jin, the creator of the Kagerou Project.

[5] The series is animated by MAPPA and directed by Hiroaki Ando, with Dai Satō as scriptwriter, Shinpei Kamada as character designer, and L!th!um as music composer.

[6] It premiered from April 3 to June 19, 2020 on the Animeism programming block on MBS, TBS, and BS-TBS.