I thought it was something from the No Guns Life manga but I'm sure it's not the only series where people have giant weapons for heads.
https://www.fuwafuwanosora.com/wp-content/uploads/2019/12/2083536_English_KeyArt-OfficialVideoImage_906ca3b8-02f6-e911-82a8-dd291e252010.jpg
I thought it was something from the No Guns Life manga but I'm sure it's not the only series where people have giant weapons for heads. https://www.fuwafuwanosora.com/wp-content/uploads/2019/12/2083536_English_KeyArt-OfficialVideoImage_906ca3b8-02f6-e911-82a8-dd291e252010.jpg
chainsaw man is real good, and you should read it.