Hime

The protagonist, whose real name is not revealed, is referred to as "Princess" by those around her. She is a princess on the human side opposing the Demon King's army and the commander of the third knight division of the royal army. Her trademarks are her long blonde hair and the small crown she always wears on top of her head (she wears a knit hat with a crown logo at ski resorts and skating rinks). As a warrior, her skills are genuine, and she awakens as if remembering her abilities when given the opportunity to utilize them in sports-related torture, effortlessly performing a lane-up dunk from the free-throw line during a free-throw contest (however, dunking during a free-throw is not allowed in basketball rules, so it is invalid, and she lost the match to a former basketball club member named Youki). She displays extraordinary combat skills, instantly defeating Inki with her lightning-fast moves in a beach swordfight (where losing means having your head's paper balloon burst) and coolly knocking down all attacks from Youki's water gun machine gun.

Despite being a royal and a warrior who has undergone strict training, she is oddly well-versed in the common people's "typical" life experiences. She is one of the most skilled members of the royal army, has survived numerous brushes with death, and boasts strength second only to the Demon King in the story. She leads the knights with her noble and strong will, having raced through many battlefields and survived death, but at the start of the story, she is a prisoner of the Demon King's army. Away from battle, her true nature is silly and weak, self-indulgent, and extremely susceptible to temptation. She succumbs to various "tortures" involving delicious, cute, and comfortable things, and spends her days spilling the royal army's secrets (though the secrets are mostly trivial knowledge unrelated to the state and not useful for conquering the royal army, occasionally she talks about the whereabouts of national treasures or gaps in national defense, but the Demon King dismisses these for trivial reasons, so they are never utilized).

Although she is a prisoner of the Demon King's army, she is allowed to walk around freely except during "torture" times, and she spends her time in prison with the holy sword Ex (mentioned later). She is also allowed to have and use a mobile phone (smartphone), and the cell is equipped with a charging outlet; she can freely remove the iron ball of her shackles, so there are almost no inconveniences in her life, and she generally gets along well with the members of the Demon King's army, leading a more comfortable life than when she was a knight commander.

Initially, she showed a spirited attitude by not succumbing to torture, but as the story progresses, she begins to enjoy the torture, even becoming demanding, preferring meat over vegetables, and looking forward to the next torture despite Ex's dismay. She also enjoyed the beach swordfight with everyone and did not wish to be released, indicating she thinks her current life is the best.

Since she has been injured many times on the battlefield, she is not afraid of getting hurt in battle, but she is afraid of injections. When she heard that health check-ups are conducted monthly for the health management of prisoners, she cried and spilled secrets even though it was not part of the torture.