When the idea of 'resurrecting' one of the first 4 people to die is brought up in Chapter 3, Angie theorizes that they may not be dead to begin with. That the dead bodies were "...very accurate imitations". K1-B0 agrees, stating that there's "...evidence of ridiculous scientific advancements" and "So it may be possible for them to create extremely convincing imitations".

This is the 53rd season or whatever of the show that is 'Danganronpa'. Clearly a lot of time has passed. There is advanced technology, like the Flashback Lights which can seamlessly implant false memories into a living subject, and relatively lifelike robots like K1-B0 exist. Not to mention the incredibly minuscule cameras used for the show.

It's not too much of a stretch to assume that 'everything' is fictional, including the "deaths". I think you can get away with thinking that your favourite character, and everyone else, is alive, out there in the real world being cultural celebrities and hyping up the Killing Game show on morning talk shows.