Is the riddle answered anywhere? My guess was from Ellery Queen's "The Adventure of the Seven Black Cats": The poison was on the thing that humans use that cats don't: Her cutlery.
The song is from https://mangadex.org/chapter/2e53d432-5ec1-4808-9b8b-48ad480d3e3f/2
Were the Japanese lyrics changed between the two chapters, or did this group just translate differently?
It was translated by Asmodeus scans
From https://mangadex.org/group/07ae7dfe-3431-4de3-9681-4a5b95e2688e/asmodeus-scans
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Is this an all-girl school? I can't recall seeing any male characters, but it seems odd to say "All types of students welcome" to include non-human students, but not male students.
From chapter 1:
"... and made fun of those who got shafted in the net...!"
From chapter 3:
Character uses an object based on Nintendo Switch.
From chapter 5:
"I end up lazing around for countless hours looking at my phone...!"