That I Sadly Don't Remember What Was Called - Tumblr Posts

Heyo, does anyone know about this anime or manga?? I don't remember what it is called but it was about a kid that was suffering and his family or people were also suffering then he went to a grave that belonged to a god but the god pretty much makes the kid's life a hell since he lost all his people and family. Then he got cursed and became immortal and unable to age or grow up if remembered correctly. Then the kid becomes a vengeful samurai and meets some new people along his adventures. Please anyone knows what I am talking about, please let me know because I watched a trailer of this anime around 2020 or 2021 or 2022. Then I read the manga online and it was ongoing, please let me know and thank you