Good story generally, it's refreshingly different from what's out there right now. The plot armor is tooooo bloody thick though. My main problem is the MC progression. He moves from being able to beat and under prepared group of 3 C rankers to without any training, skill or ability being able to beat a bloody S RANK fighter. Even if we factor in him leveling up after defeating the C rankers (which he didn't, he did that after beating the S rank) no where would he be able to much less fight on even footing but beat an S rank swordsman armed with the appropriate gear. He didn't have enough power, training, experience, ability to pull off that herculean feat. A possible B rank beating an S rank. They made excuses later but for me it couldn't fly. Even a later opponent doubted the MC having the ability to defeat the S rank and he was significantly powered up then. It would have been better if MC had realized his shortcomings, fled from S rank, gained exp and other abilities and re fought S rank and won. His luck ability has to be maxed out for this to make sense.