TLDR: This is a generic and boring Isekai with annoying characters.
This anime is so bad, Truck-kun couldn't be bothered and left the MC to work himself to death because the MC's little sister died. Boo-hoo. The MC was already a master in medicine and now, gets injected into so noble family's kid. Sucks to be the kid since his body got stolen. Other than now being rich, the MC has all his past life knowledge, gets amped with divine powers and solved the kingdom's problem, with cheap medicine in his drug store. God, I feel dumber from watching this. I would say this was meant for kids but there is a bit of violence in it. Maybe special need teen could watch this. I rather watch grass grow.