Rock Sugar and Water

[Campus] A glass of water with rock sugar added, you will never know whether it is sweet or not until you taste it. [Fantasy+Traveling Book] I thought it was a youth love campus story, but what the hell is this? Another world? It's also a depressing campus story! And there is God! [Online game] Can you recognize who is who among the data characters? I recognize it, just because it's you. Different worlds, different selves, all mixed together, what will happen in the end?