Hatsukoi no Hito to no Hare no Hi ni Reijou wa Uragiri wo Shiru: Shiawase ni Naritai node Koushaku-sama no Kyuukon ni Damasaremasen

She was meant to get revenge on her traitor, but now she's completely surrounded by the Duke's obsessive love!?

After being dumped by her ex-fiancé because he was a knight, Tiziano is proposed to by the Duke of her dreams. However, on the day of their wedding, she learns that the Duke has a lover... She was meant to get revenge on the traitor, but before she knew it, she was being pampered...!?

(Source: Kadokawa, translated)