Steins;Gate is a Visual Novel video game published by Kadokawa Shoten released on June 23, 2010 for the PlayStation Portable.
Unlike most games this isn’t based on an Anime/Manga, instead the Anime is based on the game!
Story: A group of friends discover a way to send messages back to the past by modifying a microwave, which eventually allows them to travel in time. But there is a problem, an organization called SERN found out about it and now it’s coming after them!
Steins;Gate (Japan) PSP ISO Download: