紫证书
The PerpBook（日：紫疑者の冊子） is a piece of evidence that can be used in Yellow's Justice ACT. It is a purple book which was used for pressing flowers, a key piece of evidence in the trials held in Yellow and Blue's battle in Chapter 5.
-
Finding the PerpBook in Yellow's room
- The PerpBook is likely a play on words. Perp is a shortening of the word "perpetrator", as in a person who commits a crime. Perp is also phonetically identical to "Purp", a shortening of purple reminiscent of how item names are often comedically shortened. This foreshadows Seth's involvement in one of the four trials in Yellow and Blue's battle.