Kyouko Aono

As Tsukune’s stubborn and fiercely overprotective seventeen-year-old cousin, this tomboyish human accidentally stumbles into the supernatural world while searching for Yōkai Academy. After delivering a dangerous package containing the soul-stealing Lilith Mirror, she uncovers the academy's true nature. While her friends desperately try to hide the existence of monsters from her, she remains a complicating force, even mistakenly suspecting Tsukune of yakuza ties while attempting to navigate the chaos of the school festival.