Kiruko Matsuoka, also know as the Queen of the bad jokes, is a character introduced in Volume 4 of Highschool DxD: Яe-birth, and serving as a secondary antagonist/protagonist of the next one. Dubbed 'The strongest Human', Kiruko is an idol-hunter which admires the class idol Shiori Kamiyama, and see in Ichijou Tsukino a possible love rival. She's also the current host of the Evil Black dragon King Vritra, as well as all the Sacred Gears containing the fragments his soul.