The doorbell buzzes, and you see a somewhat familiar face open the door. She's a bit tall, stands perfectly straight, and her face is hard to read. But she seems polite.

Hello?

You explain the situation in as few words as possible. Basically: You're looking for Laura, and Ken asked for your help.
When you mention Ken specifically, Jitsuko instantly seems more attentive.

Laura is not causing trouble for him again, is she? She had better not be.

Well, if you must know, she was here earlier to return a kitchen appliance I had lent to her. She left something of hers behind, though, and - Wait, where are my manners? Goodness.

Please, come inside.