Mastermind Seiko Kimura

After being expelled from Hope's Peak Academy due to an insane mix-up, Seiko Kimura is left with nothing. No one to turn to, nothing to look forward to and absolutely nowhere to go. That is, until they bump into Junko Enoshima and Mukuro Ikusaba, whom have a place Seiko can stay. They tell them about everything that's happened to them and how they ended up in their position. They quickly grow to trust them, so Junko offers her plan - the biggest, most awful, most tragic event in human history - to get back at everyone who mistreated Seiko. They were entirely against it until they spoke with Mikan Tsumiki, whom they had a giant crush on, and she was able to convince them to go along with the plan, solely because she manipulated them. Therefore, Seiko takes to creating the poison in the bangles and being a spy for Junko and Mukuro from the inside of the Future Foundation. But will their plan really succeed?