When a number of female murder victims are discovered in Ueno Park with lilac flowers in their mouths and one of Shizuru's books by their side, rumor spreads that he may have some involvement in the case. Worried for her friend, Tsugumi learns that the murders seem to be inspired by a certain book where both Shizuru and Sasagoi-san have ties to the author. When Shizuru is taken away by the police for questioning, Tsugumi works with the rest of Fukurou to find the real killer before it's too late.
However, when that becomes 
the only world you know,
،لكن، عندما تنتهي تلك المعرفة
Wenn dieses Wissen mal nicht ausreicht,
Pero cuando acaba ese conocimiento,
Pero cuando acaba ese conocimiento,
Mais si on ne voit le monde
qu’à travers eux,
Però, quando quello diventa 
l'unico mondo che conosci,
No entanto, quando o
conhecimento chega ao fim,
Но когда эти знания заканчиваются,