Unnamed Memory, Vol. 5 (light novel): Prayer of Silence — Kuji Furumiya

The End of the CurseFifteen years ago, Oscar was cursed by the Witch of Silence to never sire children, seemingly dooming the Farsas royal family line. And though Tinasha finally succeeds in ending the wicked enchantment, there is little time to celebrate, as one incident crops up after another. In the midst of it all, the Witch of Silence makes her move. No one has ever known why the powerful woman cursed Oscar, and the truth is more shocking than anyone could have realized.