I need some help, I have an idea for a fanfic but I'm not sure how to keep two characters from dying.
My idea: I just started watching and finished all the episodes so far for HRI (High-Rise Invasion), but I want to do a fanfic where two characters from Yu-Gi-Oh Vrains (Ryoken Kogami and Specter) end up in said world where one is trying to find the other. Ryoken has been missing for six and a half years and when he was trying to get get home he ended up in HRI. While Specter was trying to go to another world from the world he was already on he ended up in HRI instead. The problem that I'm having to trying to make sure that neither character dies and gets home but I'm not sure how to do that. I also want one of them to become an "angel" but I want them to go back to normal when the mask is taken off or some how gets broken. Because in the show if that happens it actives the suicide command and I don't want that to happen. I also don't want one of them to go into hibernation mode either, that happens when the mask gets damaged but not completely broken. And for those of you who don't know what hibernation mood does, it put the "angel" to sleep. Slowing the bodys' functions down until they die, it's meant to be used to get rid of "defective angels." So can someone please help me come up with an idea that would make sense?