Board Thread:Questions and Answers/@comment-36009152-20191013202225/@comment-36009152-20191021234646

A good range of views as we guess on the meaning (if any) of Guren's blue eyes in that image, we can all be counted on to give the best guesses so well done everyone!

Would speculate the chapter would be a flashback one, or Guren having an out of body experience (Noya has returned in the main series manga, perhaps Guren had another interaction with him before).

Well that's one wild guess anyway, on the assumption the blue eyes are a signal for us!