It's just an incredibly boring, juvenile and generic trash manga. It takes some parts of isekai adventuring and modern day childhood friends and dilutes it until it has nothing at all because neither part stands out.
It desperately attempts to be original by mashing together two completely unrelated settings (isekai dungeon crawling and normal childhood friend stereotypes) in the hope of something unique and fun, but greatly falls short because it really has nothing original to show.
The main character has no personality worth mentioning, he's just a boring, dull protagonist with little energy in his actions. The childhood friend dragon is just a normal stereotype childhood friend who pretends to not care that much about the mc but is obsessed. The four minions are supposed to be funny but 4 people with one-shot gags to repeat every time and single trait personalities isn't funny.
It just feels like someone very untalented in story writing hoping to hit the jackpot but adding nothing worth mentioning to the mess he created, having no clue how to write a good story, instead just trying to milk stereotypes that take no effort to write. Some people should just give up on writing stories and stick to just drawing for novelists.
I mean, really, what's the point of an isekai setting if you don't use it properly and instead just show "otherworldly" parts that are thinly veiled modern caricatures that you don't delve into or the childhood friend setting if you don't use the fantasy setting to make the events truly fantasy-like or the characters act like fantasy characters instead of normal modern day humans? It's like ripping the brand logo off and disposing of the item itself.