Artist's commentary
Hang in There, Kogasa-san 3608
It was an "It's not there! The sword's not there!" kind of moment! :-)
A line spoken by Atsushi Kanemoto to Kazuto Kirigaya in Sword Art Online: Alicization.
It was a game called The Room VR: A Dark Matter, and it was pretty fun. I solved it in about half a day, though, so it seemed a bit of a waste.