Summoned to a foreign realm as a hero, Kamishiro Kanna faces a treacherous princess who seeks his demise upon discovering his lack of mana. With the help of a captivating half-elf companion he encounters in captivity, they flee on a dragon. Unbeknownst to Kanna, shortly after their escape, the princess summons three high school acquaintances of his, complicating his newfound quest.