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The maniac who was crazy about all kinds of fields such as military and steampunk had been reincarna...
It's still ongoing so things may change, but the protag of this historical reincarnation story spent his entire adult life in the modern world wholly uninterested in anything but making stuff, & that's only continued in life 2. He's only getting married due to political pressure, & only visits pleasure houses to scout out secret agents. Attraction is so far off his radar it's on another planet.