Did Bonbello get a bit more human? Or did he have a weird past and the MC's action of giving the Diva back made him change a perspective to things. I'm guessing that in the past, he resolved to not be afraid of death. But when the owner asked for the Diva and he didn't have it, he probably changed from not fearing death to "knowing he was heading to death". The trick of letting Kikuyo give the Diva, probably made him see the MC differently as more like an angel. Anyway, that's my thought, what are your thoughts?
EDIT: I think this is reinforced by the fact that the Boss tells him not to get involved, but still does to try to save the MC's life. I think this was highlighted when the MC looked at the camera showing that the MC was acknowledging that she was placing all trust into Bonbello's hands. It is probable that Bonbello's life was filled with shitty people and waitresses and the MC's actions of giving full trust and dedication towards Bonbello, changed him to try not to be a shitty person back to the MC (Basically what I stated above, but looking for further analysis).
EDIT 2: I also have another question, why doesn't this manga have a gore tag?