You play as Tetra, a teenage boy living his days out as an college student. Tetra meets Autumn; a girl he first met on a social networking site and has grown fond of. Tetra is invited over to Autumn's house for the first time for a date night. However, the two find out that they are out of Autumn's favorite chips.

Infinity Saga's story revolves around Tetra, a teenage boy enrolled in college as an art major, who becomes smitten by teenage girl named Autumn through a social networking site. One day Tetra gets invited to Autumn's home for movie night, as well as to meet her cats. After running out of snacks, and unable to find Autumn's favorite chips, things go from bad to worse when the electricity goes out, and leaves Tetra and Autumn vulnerable to the evil lurking outside their door.