The End of the World: the Beauty Next Door Is Actually a Battle Angel

When a different apocalypse came, Ye Huan thought he would be the savior. But, why did he gradually become a support? Not brainless (a little but probably not too much), no system (there really is no system for mentally retarded people), no time travel (what else can we wear in the apocalypse), no rebirth (this is really unnecessary), no hoarding of food (won't you get diarrhea if it's expired?), No harem (this thing is not accurate either). Logic is online, please try it.