The background music and theme songs for the Pet anime. On the 18th of November, 2019 the official website revealed the opening theme song for the Pet anime. The third promotional video revealed the ending theme December 2, 2019.
Chō no Tobu Suisō (蝶の飛ぶ水槽) (The Tank the Butterfly Flies in) Edit
The opening theme song performed by TK from Ling Tosite Sigure.
The ending theme song performed by Memai Siren.