100 Days of Solitude

Aliens have invaded the earth, and people are forced to take refuge in giant bunkers underground. S.U.M.1 is a loyal warrior who is sent to the surface to rescue survivors and report back daily. His mission is to guard humanity's self-defense zone from aliens. However, this daily routine has gradually become his nightmare. Frightening sounds echo in the woods; the base is subject to frequent attacks every day; the power supply in the tower fails; and the repairman fails to show up. His boss never told him about his predecessor. Loneliness and paranoia slowly eroded his sanity. Are aliens really lurking in the forest? Or has S.U.M.1 been tortured to the point of insanity?