About the anime, "When They Cry"?

My friend and I were watching this anime and got confused up to the 5th episode. Because in the 4th episode, Mion and Rena die from being beaten to death by Keiichi then Keichii dies later on from the drug that drove him to suicide. After that it seemed like nothing happened at all from watching the 5th episode... did they come back to life as demons or what? SOMEONE PLEASE EXPLAIN WHAT HAPPENED AND WHATS GOING ON????!!!!! Thank you. :D