Demon King Daimaou: Volume 4 by Shoutarou Mizuki

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!