The plot moves extremely fast, the things that are happening aren't explained in detail, the characters who have never meet the main character who in turn has returned to 40 years in the past just go along with whatever he says even though in reality they really shouldn't.

For example, the merchant, the merchant has been importing a lot of "magic stones" from the east by boat because the empire where he lives and the main character lives apparently can't produce them themselves, so the main character marches in to the office of this big time merchant using the name of a nobleman basically committing identity theft or fraud in the process which is an extremely serious crimes in medieval times, he not only does that but he down right tells the merchant that he knows how to make "magic stones", he then tells the merchant "btw i lied im not associated with a nobleman" he then asks the merchant to in exchange for the recipe to make magic stone the MC need his help him smooth over a problem where the main characters friend beat up a knight and they need to give a high ranking officer some golden armor to smooth things over... the merchant who has been lied to by a person he dosn't know and a person who says he knows how to make magic stones which noone in the empire knows how to make without telling him anything about it or proving he can do it just caves and does as the MC tells him... no mind controlling magic here just plot armor, if this situation would play out realistically the MC would have been in some serious trouble for invoking a noblemans name without having the right to do so but no.

The entire manga is like this, people agreeing to unreasonable demands without an explanation, it's as if the side characters are just NPC programmed to agree with the MC at all time without any rime or reason.