Boku dake ga Shitteiru

After a long hospital stay, Akira was worried about a female college student, "Misaki", who was a fellow patient.

It seems that she has promised to meet a man whom she became close to on SNS...

[From NovelGame]

This visual novel is something of a fandisc for all the previous VNs from the same developer, and as such it contains spoilers and bonus after stories for characters from those games. Proceed with caution.