The annual school festival is coming up, and everyone is looking forward to the PNP (Prism Night Party) where an event called the PPP (Prism Prince & Princess) is the main highlight. Priecia, who has challenged Hyaweh to a duel, is convinced to participate in an acting competition, thanks to Fel and the Headmaster.
Upset that Hyaweh got injured protecting her, Priecia runs away from school and meets a nun named Teresa. Teresa questions Priecia's beliefs and makes her ponder why she wants to be a knight.
Hyaweh, Priecia and the others are assigned to protect a frontier fort. Arriving at the fort, the students are ambushed by an angel. When Priecia is injured, Hyaweh unleashes the power of his sword and destroys the angel.
Hyaweh, Priecia and the rest go into town for the day. After an embarrassing situation Hyaweh and Priecia run away and end up spending the day alone together, but they soon get attacked by enemies and Priecia gets kidnapped, but Hyaweh is ready to save her.
The Prism Exam, dubbed Puriken by the headmaster, is about to begin. Priecia is having difficulties of indecision about being a knight, but was later enlightened and encouraged by Hyaweh's words.
A new student named Kagura follows Priecia claiming to be her new bodyguard. Priecia challenges Kagura to a duel and decides to accept Kagura's protection.
Hyaweh makes fun of Priecia and angers her. Her admirers search for different ways to get rid of him.
An assassin is sent by the Sablum to kill Priecia. Everyone mistakes her as the princess instead.
The Sablum Empire has been attempting to take over the kingdom of Windland for many years, and are now plotting with the mercenaries Sister Hell and Darkness Knight to start a new offensive using powerful magical beings called Angels. Hyaweh, a carefree yet talented swordsman, and Priecia, who just might be the lost princess of Windland, are enrolled at the Knight's Academy in Windland to hone their skill at swords and sorcery. There they meet many friends and allies who can help them protect their homeland from the impending invasion.