Any of the Science Adventure series; Chaos;Head, Chaos;Child, all of the Steins;Gates, Robotics;Notes DaSH & Elite. All of them are incredible.
AI: The Somnium Files and Nirvana Initiative are both amazing, as well.
And I also have to recommend Opus: Echo of Starsong.
Honorable mentions to Atri: My Dear Moments. And Summer Pockets.
Any of the Science Adventure series; Chaos;Head, Chaos;Child, all of the Steins;Gates, Robotics;Notes DaSH & Elite. All of them are incredible. AI: The Somnium Files and Nirvana Initiative are both amazing, as well. And I also have to recommend Opus: Echo of Starsong. Honorable mentions to Atri: My Dear Moments. And Summer Pockets.