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.
Goodness, what an unusual 
place to be selling goldfish.
.عجبًا، يا له من مكان غريب لبيع السمك الذهبي
Du liebe Güte, was für ein ungewöhnlicher Ort,
um Goldfische zu verkaufen.
Vaya, qué sitio tan extraño
para vender carpas doradas.
Vaya, qué sitio tan extraño
para vender carpas doradas.
Oh! Che posto inusuale
per la vendita di pesciolini rossi!
Ora, que lugar incomum para
se vender peixes dourados.
Ух ты, как необычно,
что здесь продают золотых рыбок.