[Denker]

Yeah, I know why she is there. I just don't understand the timeline and the enemy's motivation.

Spoiler for From Party to Mansion:

Meaning, she was in the party with the heroes and Rio, but somehow she got to her Kingdom before Rio. In the WN it makes sense, since she appears in the mansion right away. She never went to the party in the WN. So I guess it's explained in their conversation.
Still, why did Reis do that? In the spoilers, I thought it was to uncover him and send a mob of knights after him. But if he was already helping the princess escape...
Did he do that just to annoy/"threaten" Rio? To tell him "Hey, I know who you are"