Hexa no Uta o

Friday, December 6, 2019.
The world's most powerful computer virus, "Cheap Trick," broke into Sorei Academy's main system.
The virus locked down everything, leaving seven people stuck in the school.
All outside communication was cut off. And with how weirdly the academy was built, there was no way to force your way out.
The only thing still working was a single network line connecting "Azure Sky" and "Dawnland."
Sometimes cheering each other on, sometimes getting pissed, they grew closer as they searched for an escape route.
But just when things looked up, the Grim Reaper reared its head like it was laughing at them.
One disaster after another; everyone started doubting everyone else.
And then, the repeated murders...
Is the killer among them?
Or is there another murderer hiding somewhere else?
Mysteries stacked up, twisting together into one huge puzzle blocking their path forward.
And when all those mysteries converge—the world falls apart.
Caught between reality and fiction, what will they see? And what will "you" see?

[Translated from hexarego]

P.S. This VN is considered to have mystery and plot on par with Ever17 and other Infinity series titles. The questions arc is complete (first 3 episodes), but unfortunately the last episode of the answers arc hasn't been released, so it's not fully finished.