Manga by author Ichimura Tetsunosuke

Asato Kanami who was summoned as a hero to another world Istalia.To stop the war between the demons and humansIt is said that he was summoned by Anna, the saint of the Kingdom of Elshnon.After a year of war, Asato finally challenges the Demon King Lione.Just when he thought the battle was over, his summoner Anna attacked him and the Demon King.Asato who survived the attack and was protected by the Demon King.What is the future path for the hero betrayed by humans...!?

Kay Brennan is a hero, no doubt about that. They're the strongest person in their school in terms of combat strength and magical power. Compared to Kay, Dino Turner - the eternal 2nd place - might as well be nothing, and as such Dino has declared Kay to be his archrival. However, Kay has a secret: she's actually a girl crossdressing as a boy. And Dino is the only one who knows her true nature.