Akuto Sai's life is about to get even more complicated. Junko Hattori invites him to visit her family home, without telling him that the occasion is an arranged marriage meeting — for an arranged marriage between Junko and Akuto! Meanwhile, an assassin comes to Constant Magical Academy, targeting the air-headed Keena, of all people. Who is behind this assassination order? And most importantly... how will Akuto react when he learns of this plot? Prepare to see a darker, angrier Akuto in Volume 4 of Demon King Daimaou!