Finding a manga

Y’all I need DESPERATE help trying to find a manga I’ve been looking for over a year now. Not even ChatGPT found it btw, I also read it on Mangago in 2020/2021

So it’s about this 11/12 year old mafia boy who lived in Italy with his dad, before returning to Japan after his mother’s death I think.
After returning to Japan he finds out that his mother helped shelter these 5-6 really strong people. And before she died she sealed them into a scroll. Now my memories kinda fuzzy about how they came out of that scroll, but it ends up in these guardian like people taking care of him. My memory is very vague but I remember some scenes like a two of these guardians fighting, one of them cooking for the boy, a barbecue scene with all of them together, one guardian who has green hair and never opens his eyes until a fight scene occurs. I do have some other details but this question has become TOO long.
PLZ HELP ME FIND IT I NEED TO KNOW BEFORE I DIE