After several years of working at SDM and serving Lady Patchouli with your colleague Koakuma in the library. Eventually you and Koakuma started dating.

After that, several months of your relationship passed, and while walking through the library, you noticed your girlfriend Koakuma looking for the right book for Patchouli in one of the many bookshelves. A moment later, she immediately found the book she needed (thanks to her abilities)

Koakuma: "Ah. There you are"

She murmured softly and took this book.