Dungeon break happened all over the world n mc got sent to the past after encountering an item, he got sent to the day (or a day before i forgor) where the first dungeon to break happen in the future timeline just pop up deliberately. Now he's trying to save and educate these teens to prepare for the future. Oh and he's a lab rat of a cult and you will learn more if u continue reading it i swear its good

I’m on chapter 5 currently and don’t understand what’s going on.. can anyone tell me?