Here ya go.
MangaDex Forums
Angry_Panda
despairotaku
@Angry_Panda NO NO NO NO NO THAT SONG GOT STUCK IN MY HEAD TOO
Angry_Panda
@despairotaku ONLY ONE WILL SURVIVE
BakedBanana
I got you, another anime about a socially reclusive main character with a fun looping song:
Source: Welcome to the NHK