Being quite honest, I almost have an aneurysm reading this, the story is so rushed that I can't enjoy it, there are too many holes, like him unlocking his power and no one sensing it... in Tokyo which is literally the base of jujutsu in Japan. Or the MC acting like an idiot adult even though he is 4 years old and everything is fine (great sage or not it would be easy for someone to discover something wrong with him) and him literally creating a sword style out of thin air (parallel and quick thinking are no excuse) when he has never used a sword before, thinking 1000 times allows someone to learn much faster, but not to the extent that the author describes because many of the great sage's skills only work because Rimuru has skills to complement them... in short, the story is very poorly written, with a strange development that makes him super powerful from the start because... I don't see any beneficial development in this story
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LIKEIt is one thing to 'give him some slack' and the other is to ignore the problems. In 50 something chapters I read I didn't see any significant improvement in grammar, plot or overall reading experience, so I would say BrazillianFox may be a bit harsh, but that is more or less true.
I am not denying it. I, myself have only managed to read up to 7th chapter then dropped it. I am just saying that his second fanfic is better than this one. So, you see a improvement there.