I'm just thinking that Orpheus is Garam while Eurydice is the professor. Garam is saving professor from it's past where all of his anxiety coming from.
That's why professor still see the old manager and live with guilt. And garam is there to pull him out from that darkness
I don't remember the details right now (I'll update when I have time), but I think it's a story about someone who lost a loved one, and it's their story of trying to win back that love (just like the professor lost his manager, and he is trying to win back that love with Garam).
But there it is, the title says no more Eurydice, hence I think the professor is trying to move on about the loseb of the manager.
And that's it, obviously both stories transmit a lot of pain, hence the whole metaphor of the knife (sorry for the spam) ...
i don't really get the parallels between this story and the tale of orpheus and eurydice could someone help explain