Tsuihou Akuyaku Reijou no Dannasama

"I" had the luck of being the one who reached out towards the young lady whose engagement was annulled by Prince Alephaldo, Elana. The day after the annulment, I was banished with her and married even though we dated for exactly 0 days. Well, it's just a slow country lifestyle of banishment in the neighboring country! Or so I thought, but...? This is my story about becoming a banished villainess's husband.

(Source: Hakusensha, translated)