Board Thread:General Discussion/@comment-38844844-20200201162627/@comment-36009152-20200201164017

It's tricky with the genre since it could end with people loving and marrying one another simply because that's the go to formula for endings of shonen series. Yet on the flipside they are equally likely to simply focus on the story elements and not romance related areas XD

So the answer could be 'no one' since they both act as a squad along with the rest of the team. For this part though:

LauraTepes wrote: Who do you think Yū might fall in love with in the future?And who do you think will be the second person in the OnS universe Mika will be addicted to and even maybe fall in love with? Having seen Yu throughout the manga, who in your opinion do you think he is going to fall even more in love with XD Secondly with Mika's feelings fading and him never showing any affection to anyone other than one particular person, how likely is it that he will fall in love with a second person XD

It may well be addressed, the topic has been breached with Shikama Doji manipulating Shinoa's emotions, and if those strong feelings are the gateway to possession then a scenario of demons fully taking over humans is not a far off future possibility. Would bear in mind the past Yu and Mikaela could have different people in mind - yet it depends if they are literally the present day Yu and Mika, or if they just have the genes or powers of those past beings.