Connor Lethe, a small YouTuber known as Kirionnor, receives a mysterious letter one night, signed from no one. The letter read, "Uif Voefbui jt dpnjoh. Uif ebzt hspx tipsufs. Uif qpxfs pg uif Mpoh Ojhiu hspxt. Uif xjoe jt cjuufs dpme. Uif mbtu dibqufs xjmm dpnnfodf, boe uif uxp uipvtboe fjhiuffoui zfbs xjmm dpnqmfuf uif dzdmf. I will see you soon, λήθη." Will Connor be able to save our world before the Long Night, or will The Undeath successfully complete?