So as you investigate the second murder, you find out that Toko has Dissociative Identity Disorder (or DID) and she has a second personality that is a crazed, professional serial killer. The game mentions this multiple times since the murder that occurred was set up similarly to her method of killing.
So the second trial starts and before anything happens, you have to bring up that Toko is the top suspect since she has a mental disorder. What disorder do you tell everyone she has? DID, the one that the game shoved in your face for the last half hour? lolno the answer is Schizo obviously (because they couldn't bother to fit schizophrenia in there I guess). What do you mean DID and schizophrenia are 2 completely different and unrelated mental disorders? They're both mental disorders so it's okay. Just like a stomachache and leukemia are both diseases too so they're basically the same. Just like how Danganronpa and Animal Crossing are both video games so they're basically the same.