So she's frowning 'cuz she just reached his Bad End? Or maybe Hisao's meds are messing with his sleep again, and she's on her way to "read him a bedtime story" (complete with clearly marked Book) and doesn't want to get caught sneaking into the boys dorm after curfew.
@40165: Its a regular school textbook, but inside it lies an issue of Cosmopolitan she borrowed from Misha with the article '101 ways to please your man' bookmarked. Nervously she hides it from Hisao with the intention of reading it in the library later.
CID 40165, posted on March 24, 2012: