Steins;Gate, an adult visual novel developed by 5pb and Nitroplus. First published by 5pb, and later by Spike Chunsoft. Released for Steam on 9th September 2016. Available for download on JLIST and Steam for $29.99. Available for PC Windows operating systems. Full voice acting. No sex scenes.
The story follows Okabe Rintaro, a socially inept university student, as he gets caught in a life-threatening conspiracy. Okabe and his childhood friend, Mayuri, attend a time travel convention hosted by a quack scientist claiming to have discovered how to make a time machine.
Source: N4G PC [NSFW] Sci-fi Visual Novel Review: Steins;Gate – Hentai Reviews