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.
There was a lilac flower 
in the victim's mouth,
،كانت هناك زهور ليلك في أفواه الضحايا
Im Mund des Opfers
befand sich eine Fliederblüte
Había lilas en las bocas de las víctimas
Había lilas en las bocas de las víctimas
Il place un livre près du corps
et une fleur de lilas dans leur bouche.
Nella bocca della vittima vi era un fiore di lillà
Havia flores de lilás
na boca da vítima
У жертвы во рту находят цветок сирени,