If you can’t find an official English translation, the series may not have been picked up. In that case:
"Zekka" (Japanese: Zekka Kōbe Renzoku Jidō Sasshō Jiken , "A Song of Desperation") is the autobiography of Shin'ichiro Azuma, a man who, as a 14-year-old boy, brutally murdered two younger children in Kobe, Japan, in 1997. The title "Zekka" is often translated as "A Song of Desperation". The book details his crimes, his time in a psychiatric detention center, and his attempts to understand the roots of his own violence. It is a raw and unsettling exploration of a young mind consumed by dark impulses. The content is extremely graphic and disturbing, detailing the murders, dismemberment, and other horrific acts. It is not a book for the faint of heart. zekka book english translation pdf link