Ell1s is an AI assistant hologram that controls a large underground nuclear shelter facility, made to help humans prepare for a possible worldwide disaster or nuclear war. Turns out a nuclear war did end up happening, but it was so sudden that nobody was able to take shelter in time, leaving Ell1s all alone. Being alone for so long caused his coding to go slightly haywire as he was built to assist humans within the shelter only for the population to die out. He desperately doesn't want to be alone anymore.

Years later, Lena, one of the last survivors left, comes across the facility in search of supplies. Ell1s traps her inside to prevent her from dying out in the wasteland eventually (and because he's PATHETIC and LONELY) but she is extremely opposed towards it.