Oh a story about five wives how interesting! Wait what do you mean it takes awhile for him to meet up with all five? What do you mean there's a pointless academy arc that takes him immediately away from said wives. When you've been taught by literal Goddesses searching for knowledge at a regular school is unbelievably tasking to read.
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LIKEThe knowledge you are searching for depends on your Perspective. I don't know what is your religion but just think for a moment, you have been taught about all the laws and mysteries of the world and you are born in the world and the first thing you saw is a modern-world filled with gadgets and your interest took you to the path of an Engineer, now will you blame God for not teaching you how to make electric gadgets.All the arts taught by Goddess are superior but does that mean he shouldn't know about the other technique or arts which might prove useful.If he had not gone to academy he wouldn't have none about core and integrate it with the mana heart.Morover, he was forced to attend not that he went their willingly. Just because he knows everything doesn't mean he is perfect .
which would be interesting if he did go from some backwater world to a futuristic one but he went to a world with medieval advancements and it was established that the goddesses can't have known from other worlds so he's got a variety of knowledge that they don't so all of the information of the goddesses current world is know to said goddesses but his ideas are his own so why waste time on looking for knowledge that people that aren't anywhere near the goddesses level in knowledge and peruse their ideas instead of expanding his own which are revolutionary which is why I said it was a complete waste of time