In modern Japan, a humble old man who avoided becoming a wizard suddenly died and was reincarnated as a duke's daughter in a different world with magic in the 18th century.
Is it an otome game? Or is it the world of games such as RPGs? Although he was hesitant for a while, he himself has a mental maiden part that liked stuffed animals, dolls, and anime for girls . start.
His previous girlfriend was also reincarnated in this different world and was a prince.
The two get to know each other well and become engaged, but as they gradually enter puberty, their genders are reversed and they run into social problems related to gender...probably.
In a world without prior knowledge, I developed sanitary products based on the knowledge I had somehow, and lived my life without paying attention to the development on the eve of the 18th century industrial revolution. A story depicting the growth of a TS reincarnated daughter who grows into a queen.