Story being continuing..
(Recap): (erica): Kaori... I lost the key... I can remember that I did put it on the filter but it is disappeared somehow (with a crying face), (kaori): WHAT?? how the heck??? You know we can't stay here if we don't have their authorised keys????, (erica): ummm I'm so sorry for making another trouble to you (with a crying face), (Kaori): don't cry we will definitely find it (while convincing erica), (erica): hmm yeah, (Kaori): although I'm not sure how can we find the key without any evidence...