What happens to the members of W.I.S.E. near the end of the Psyren? Towards the end of the manga,


   After Ageha presses Miroku to go a different way to making a society of Psi users,
 we are shown an airstrike that flies in and demolishes a huge portion of the forest.
 WE actually see Ageha and his friends escape, but there is no mention of Miroku and his
 companions.  In the last chapter, it is mentioned that the world "believes" they are dead.


Are we to assume that they die? Or is it that they go off into hiding?
If you look at chapter 145 (page 4) in the manga, you can see this:



Yoshina asks No. 7 about Ouroboros, and she says that it has disappeared into space again in exchange for her brother's and Grana's lives.

So, if we take the words of No. 7 seriously, yes, they died.