Pre-Lunatics depicts the events occurring shortly before and at the very beginning of case#0:lunatics. It shows a glimpse into Ryo Kazan's mental breakdown following the events of Moonlight Syndrome, Sumio Kodai leaving HQ after getting a bad feeling, and Tetsugoro Kusabi looking at a picture of Toriko Kusabi and Christina. It leads directly into lunatics, with its last few pages matching the beginning of the case.
 
(Source: Suda51 Wiki)

The three chapters are known as redout, blueout and greenout, following the same naming pattern as the new Correctness chapters of the 25th Ward remake. They expand on the roles of Aoyama, Akama and Kosuke Kurumizawa, and introduce a new major character, Midori Midorikawa.

The Silver Case: Case #4.5: Face is a spin-off of The Silver Case, taking place (as the title indicates) between case #4:kamuidrome and case #5: life cut of the main game. 
 
The story starts with Sakura Natsume and portrays a case she and the Heinous Crimes Unit investigated separately prior to her joining them.

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