Kamishiro Kanna was summoned to another world to be a hero; but the one who summoned him was a scheming princess and when his mana measurement showed 0, he was about to get rid of. Together with a half-elf kyonyuu silver haired bishoujo he met in the palace's prison they escaped riding a dragon she summoned.
The thing Kanna didn't know is 3 days after his escape from the palace, the princess did another summoning and summoned 3 high school students which happen to be his close friends.
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