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Set after Danganronpa 2: Goodbye Despair and before Danganronpa 3: The End of Hope's Peak High School - Hope Arc, with Nagito Komaeda as the protagonist and portrayed as "an ordinary boy" whose bad luck causes good luck for others. Due to suffering a very traumatic death in the program, his mind created a strange, relatively peaceful world he lives in as a coping mechanism. However, it all begins to fall apart after "The Destroyer of the World" appears.
Aired 12/01/2017EP 1 - Full
Super Danganronpa 2.5 Komaeda Nagito to Sekai no Hakaisha
Nagito Komaeda wakes up after experiencing death in the Neo World Program. What kind of world is he seeing and why did he wake up?
Nagito appears to be in a strange world, including students who have been seen before as well as people who never existed. He is an ordinary boy with no Ultimate Luck, attending an ordinary school. Constrained by being the protagonist, he thinks that having a big talent would interrupt his happiness. He believes that living an ordinary life, being moderately happy, while watching his classmates have a normal youth is what's wonderful.
However, one day, a boy calling himself "The Destroyer of the World" appears, having the form of red-eyed Hajime Hinata. He begins the destruction of Nagito's world...
(Source: Danganronpa Wikia)