Punishment: Dog Food

Punishment: Know Your Mother's Pain

Common Thread

Punishment: Love Split Evenly

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The serial killer is laughing in the rain. Punishment: Dog Food—. Punishment: Know your mother’s pain—. Punishment: one split evenly—. Punishment: Forever beautiful—. The Frog Man from Hell executes his "punishments" ...
 
(Source: Kodansha USA)
 
Included one-shot: 
Volume 2: Onna to Koroshiya (Girl and Killer) 
Volume 3: Bokura wa Shinyuu to Iu Karada de (3 chapters)