Good, scratch one trash, one more to go.
Akane is probably planning to use Yumi yandare state, she already didn't hesitate to kill Toshio in revenge and to protect her, when Yumi will find Reiji being close, she won't hesitate to kill him. It's pointless though, they're already set for a week with Toshio body.
Michika appears stronger than seems, perhaps she will kill Taichi even if he tries anything, maybe.
They all seem to have dark past, nobody is probably innocent, wonder what's the deal with Reiji or whoever set this up mixed in an innocent people to see how they turn evil.