> Some clothes. Maybe she was trying to hide the book?
> You knock on the door. All seems normal with it. But naturally, no one opens it in response.
>_
> Neatly put aside Eirin's clothes ,then pick Eirin's Notebook up: " In ordinary or mostly-ordinary conditions and purposes private belongings are not to be violated...yet right now we are under extraordinary conditions and needs... ".
> If needed,put Special Attention&Effort to select both direct and indirect passages related to:" Experimental Medicine for (Princess) Kaguya's Powers,Practical Trials by (Princess) Kaguya herself, Eirin's Recent Movements and Whereabouts , Failsafe/Antidote Measures ...".
> While reading those aloud,Cross-Compare and Match between them and what we and the fairies have been and are experiencing and discovering.
// Essentialy the Ultimate Purpose for This Selecting&Cross-Comparing-Matching,and the eventual future ones , is helping out in" Within Time-Loop Mormong-Limit Finding or Gathering Up Eirin's Failsafe/Antidote Or Equivalent,Bring It To Kaguya ,Have Her Trigger It Either Alone Or With Sakuya's Help"//
// Besides Eirin herself,who could have it on her or elements or leads to it/them,and "Eirin's Room",which could house either but at present we do not have enough knowledge to verify that and recognize it yet in the available room or after managing to open the right closed door... //
//...Important Locations to look out for those could be or related to : " Eirin's Laboratory";"Eirin's Special Medicine Stash(es?) within or near Eientei's Medicine Storage(s?);"Princess Kaguya's Room"//