Lol that escape from the demonlogist and his running style are great comedy. I don't remember many of the characters and that's fine, Momon right now to me is a great manly character.
Whoever mentioned the little sister was tagged since the first hospital, I also just noticed, the doctor asked if the hitman was the guardian. That was to inform him that the girl was beyond saving and that was why he was following Robin after that.
This is different from he webnovel/light novel. In that the dad realized his son was much more than he gave him credit for, congratulated his son for the trap and bountiful hunt and gave him a well done son moment.