Linde lost five years of his memories, along with his ability to fight on the battlefield. Now he's an ordinary lecturer, as well as a postwar patient who needs looking after.
The girls he saved five years ago have all become brilliant young women capable of standing on their own.
Elsa: "As long as I'm here, no one will dare bully you."
Sharin: "I bought the holy relic you liked yesterday. Hurry up and praise me!"
Polly: "I'm working hard to become a proper bride today, too!"
Chloe: "Is it my turn to sleep with you tonight?"
Even now, Linde hasn't realized that he's being kept. This isn't an invincible-protagonist story, just one where the main cast is very strong. No angst, no poison, no whitewashing villains, and no saintly heroine.