honestly the story is good and the writer is quiet talented too , but there were a some plot holes such as when the mc left to adventure he was undercover and only the guild master recognised him , and then left to slay the dragon , meanwhile Lancelot found his aura at the crime scene ( idk man black tech , helps you know the owner of the aura , how it works ? not explained ) and somehow and with no further lead he kind of went where the mc is ,how he knew his location ? not explained , saw him fighting the dragon , used a spell (he's a swordman who can use mana and divinity ,which is unbalanced) that teleports the enemy against his will from miles away , how it works ? not explained then he made a barrier that made him invincible , how it works ? not explained
if you read the above you'll get my first point : only a little is explained.
my second point is how inconsistent the story is , for example lancelot crossed the distance between 2 nations in a day and a half max , while in the 'castle attack' arc the duchess didn't call the Duke to come because it'll take a week ? ,i mean the distance was 20 kilometers and he was far more powerful than Lancelot so shouldn't he cross it in an 2 hours max ?