The fifth instalment of the Sekai Series.
 
An alleged prequel to "Kimi to Boku no Kowareta Sekai," when Byouinzaka Kuroneko and Hitsuuchi Samatoki were in middle school.
 
Note: Two of its chapters were released in Mephisto 2009 Vol. 2/3. Further chapters have yet to be released. 
Nisio has mentioned Boku no Sekai in 2020 and 2021, saying how he has yet to finish Sekai Series and how he should, implying he may get around to finishing and releasing volume 5 soon.

The fourth instalment of the Sekai Series.
 
For him, everything is a game.
 
Seven mysterious murders strike a prestigious girls' high school!
 
A mysterious and inexplicable murder takes place at the supposedly peaceful Senju Girls' School. What's more, the person who works there is the ethics teacher, Kushinaka Choushi. Fourteen years have passed since the incident involving Byouinzaka Meiro. The search for the culprit in this game of detective starts again. Who is the culprit?
 
(Source: Kodansha, translated)

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