Unnamed Memory, Vol. 2 (manga) — Kuji Furumiya

To lift the curse on his bloodline, Prince Oscar climbed the perilous Azure Tower and brought the beautiful witch Tinasha to live with him in his castle, but still, he is no closer to a solution. His only hope is making Tinasha his bride, and while whispers about their relationship can be heard throughout the castle, she remains unresponsive to his romantic overtures. However, one night when they secretly meet, Oscar accidentally ingests an aphrodisiac in front of Tinasha…