Responses
No , the author left it on our fucking imagination.
I’m guessing Yuta’s parents incurred some debt and granpa was paying it off in secret but before paying in full he passed away and Yuta was sold to the golden pavilion
He was handed by his father in a kind of "deal" with the yakuza. This was shown in a flashback, but I don't remember which chapter
Is it revealed how yuta ended up at the golden pavilion? What happened to grandfather?