Sunlily and Moonlily.
Two sides of the same coin, so similair yet so different. But as the light and peace dominates the Sunlilians, darkness and chaos take over the Moonlilians, turning them into mindless creatures known as Phantasmas, all seemingly puppeteered by the entity known as NULL, who plans to first obtain full control of Moonlily and the Dreamscapes of whoever ends up dreaming (thus reaching Moonlily), then Sunlily itself by taking over the dreaming Sunlilian's body. Either that, or Sunlilians get so lost inside of their nightmares that they become Phantasmas themselves, barely even recognizable anymore...
Where do you stand in all of this? You're just a young high-schooler, constantly bullied but always keeping everything to yourself in order to not worry everyone else. Your parents have turned into Phantasmas when you were young and since then, you've been adopted into a new household after being found lost in the streets.
And every night, after that day, you've started entering your own Dreamscapes; truly, the place of your nightmares, or maybe...