>>531639497
Easy mode: they have to come from different source (ex, normal, sub)
Hard mode: it can stack from the same source if it either self (de)buff or if it comes from a persistent aoe.
wtf???: Miku stacks with sHoshino despite both being auras because Miku's buff technically comes from the normal skill from the summon her EX skill generates

>started another fire drill instead of sweeping