Daraku Koujo ~Majutsushi no Wana ni Hamatta Seijo~

The town sat beneath the castle of a small country.
This country was home to the beautiful Imperial daughter Cecilia.
She was still young, pure, and terribly naive. She visited the town in disguise with impetuous energy, with her convoy Chris along to protect her.

One day, Cecilia and Chris were returning from such a visit, secret as usual, through a small hole in the castle that leads to the forest. But today for some reason a swarm of monsters were there. Chris immediately moved to protect her, but there were too many monsters.
Too many. The monsters seized Cecilia, and in a last attempt to save her, Chris too was captured.

[From DLSite English]