Tensei Mikami

College student Sota Akizuki is swept overboard during a violent storm and believes his life is over. When he awakens, he finds himself stranded on a mysterious island in another world. There, he learns that men are extraordinarily rare—only one is born for every thousand people. Because of this imbalance, the Kingdom and the Empire wage endless wars over men. In this strange world, men avoid women while women desperately seek them, creating a deeply distorted social order. Trying to conceal his true circumstances, Sota acts as he normally would, only to discover that his very "normality" is what makes him extraordinary. In a world where a man's sexual desire itself is treated as an overwhelming advantage, he begins captivating one strong and beautiful woman after another.

The kingdom's hero, Ortus (♂), dies in battle after failing to fulfil a promise he made to protect the kingdom for the rest of his life. When he wakes up, he finds that he has been reincarnated as Seretina, the duke's daughter! Even though she's a lovely, beautiful girl, she's still the same and determined to become a knight to protect her country in this life. However, besides being sickly and fragile, she is also faced with the harsh fate of a lady. She has to learn manners from her horrible mother, marry a man she doesn't want to marry, and many other challenges that will keep her from becoming a knight. Then, on the way to the royal castle, a demon attack reveals her true power that no one knows about! A new heroine is born, with the strength to slay demons with a single blow, and the peerless beauty to captivate even people in high society! She’s pretty on the outside, but fearless on the inside! The chivalric, heroic fantasy of a feeble young woman begins!