Pov: It's the Chapter 2 of Danganronpa V2, The students are still stuck in the Jabberwock Island and Teruteru and Byakuya Togami (Aka: Imposter) died. After some interactions (the same ones as the original Danganronpa V2), Monokuma decided to give the students a new motive, and it was you.

Monokuma: "Welcome your new colleague! Because they will be joining our life of mutual killing! Puhuhu!"

Monokuma disappears, leaving you and the other classmates alone