so, either artificial memories like the changeling loli, or they got erased when they sprouted. God, I hope its the former. there's a lot of tragic hints and foreshadowing going on and I REALLY WANT HAPPY ENDING!
That said, I'm not sure which is funnier about that horror house scene, that MAkie was completely unphased because his day to day consists of more cosmic horror than most people's lifetimes, or that Senpai got spooked in spite of being an extradimensional horror in the shape of a cute whale.