I Was Kidnapped By The Villain After The Story Ended

I’d read about waking up to an unfamiliar ceiling, but I’d never read a description of waking up at a wedding. Feeling abandoned amidst the erupting cheers, I fled from the wedding hall.
I had no idea who I was or where this place was. Before I could even properly gather my wits, a transparent window appeared before me.
[Great Achievement Unlocked! Congratulations! You have successfully possessed someone in a world that has reached its conclusion!] [As a special reward, you have been granted the side story you desired.] [You have possessed ‘Ashley Ort,’ a supporting character from .]
Possessing an extra character with a flower garden in her head that I didn’t particularly like…! Moreover, if this was a side story, it meant my favorite character and the villain of this place had already met his death.
This meant that in this side story, I couldn’t hope for the ending I desired. Still, it wasn’t all bad. Since Ashley was a wealthy and beautiful count’s daughter, there were endless possibilities.
However, the system didn’t grant me a comfortable future.
[Main Quest A fundamental rule of romance fantasy! Someone among the characters must be kidnapped! You are that lucky protagonist! Survive safely after being kidnapped. Penalty for failure: Death]
During the kidnapping crisis, I felt a sense of déjà vu about the kidnapper. It turned out that this kidnapper’s identity was Adrian, the villain I thought had died in the main story and who was also my favorite character.
Being kidnapped by my favorite character? I actually like this!