Responses

That is true, but if we compare the reactions and how Yu acts around others vs around Mika there is a subtle hint that Mika is different than the others (tho it could also be platonic atm). Also this story was inspired by Devilman Crybaby and that is noticable, especially now that Mika is "dying" (didn't watch the show but I know the "angel" guy actually loved the devil, and also died in the end)
Ok, I’m pretty sure Mika actually likes Yu romantically even if Yu is only about those platonic succs. I still think there’s hope for endgame MikaYu.