I've decided to make it clear now. I don't know if you understood it or not, but I'm gonna reveal what I can. The protagonist's friend had died in his house. The protagonist saw a trail going up to Freddy Fazbear's Mega Pizzaplex. In the meanwhile, influenced by richer individuals, Fazbear Entertainment decided to take their turn to send people in space by making a few spaceships. The protagonist, sceptical of the company, decided to go and work at Fazbear's to collect more information. That's all.