歌是游戏人物 Otto Apocalypse’s monologue at his dying time。

Copied from YouTube: "2022.01.21 miHoYo Anime released short anime film “Thus Spoke Apocalyse” of Honkai Impact 3rd (3D action role-playing game), about Otto Apocalypse. At the end of the film is this song “Regression”, Otto’s monologue at his dying time, touchingly delivered by musical actor Ayanga. Ayanga expressed Otto’s innermost feelings about sacrificing himself to save his loved one and gave his best wishes to the world without him. I love it especially when I listened to it using a nice headphone and can grasp Ayanga’s voices in layers of chorus which he sang with different type of vocals."