Unnamed Memory, Vol. 4 (Light Novel)

When Oscar travels to the Magic Empire of Tuldar to break his curse, he discovers a girl
named Tinasha sleeping in the castle and returns home with her.

As it turns out, she not only possesses the overwhelming power required to lift the curse but is also next in line for the throne. Curiously, despite having never met Oscar before, she immediately harbors strong affections for him...

"Would you please marry me?"
"No. Where did that even come from?"