Why Did Chiaki Die?
Her Initial Plan Was to Let Chiaki Watch the Despair Video, but Upon Realizing How Much Class 77-B Loved Her, She Decided to Kill Chiaki in Order to Throw Them...
Her initial plan was to let Chiaki watch the Despair video, but upon realizing how much Class 77-B loved her, she decided to kill Chiaki in order to throw them all into despair.
How did the real Chiaki die?
Chiaki's death in Despair Arc is very similar to Mukuro's death in Danganronpa: Trigger Happy Havoc: being suddenly impaled by dozens of spears. The deaths also double as acts of betrayal from those who were closest to them (Junko, in Mukuro's case, and Chisa, in Chiaki's case).
Why did Chiaki not come back?
Chiaki then leaves at then end of the movie, going back to his own time (he said earlier he was supposed to do right away but got distracted having fun). When he goes home he probably will get more leaps, but will not come back to the time in the movie because he does not want to, that why he said goodbye to Makoto.