These are mostly my observations and interpretations of scenes that may suggest romantic implications between Yuu and Mika.
(I also enjoy writing analyses or random commentary outside of the ship, so when that happens, you'll find a * symbol in the...
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The scene at the top is from chapter 5. The lighting almost looks like feathers in the background... This makes Mika look almost angelic. He moves smoothly and in an eerily beautiful way. Are these "feathers" possibly a reference to a "Seraph" in Seraph of the End? ------------------ So, since Yuu's wing was black (according to the reveal of chapter 13), many of us assumed that Mika's "wings" would be white if he were in seraph form (quite noticeable through fan art). I don't actually recall a real confirmation of the color of his wings if he were to have any, but the idea of white wings would make a lot of sense.
If chapter 5 is really foreshadowing Mika's "wings" and seraph form, then I think we can assume that his "wings" would be white or of a light color, when looking at the "feather" color of the scene.
