“Anyone who threatens my sister’s school life… will die.” Asari Cloud is a master assassin who carries out the Royal Family’s darkest deeds. Though he possesses zero magic power, he can eliminate any target in an instant. The reason he works tirelessly is simple, to protect the peaceful school life of his beloved little sister. But within the magic academy, the Hero’s Daughter seeks the abolition of assassins altogether and there are also those who target her. Can Asari protect his sister’s future… while living as an assassin?