A group of teenage scientists discover the ability to alter the past by sending text messages through a modified microwave. Their experiments inevitably spiral out of control as they become entangled in a conspiracy surrounding SERN, the organisation behind supposed failed time travel events, and John Titor, a mysterious internet forum poster claiming to come from a dystopian future. With memorable characters, outstanding art design and a gripping narrative, Steins;Gate is a critically-acclaimed visual that can be experienced time and time again.

My favourite sci-fi story and one of the best time travel stories of all time. Harrowing.