Night School Studio is the publishing/developer team of the game Oxenfree. The company was founded October 1, 2014, and is based in Glendale, California.
From Night School Studio's Press Kit description:
Founded in 2014 by cousins Sean Krankel and Adam Hines, Night School is an independent studio focused on the intersection of story and interactivity. The team of Telltale and Disney alumni are applying their extensive experience to create a game filled with wonder, danger, and humor. Oxenfree is its first game.