You seem doubtful. [He decided to share some of his own experience with her in hopes that it would be a tad more convincing]

There is someone I care a great deal about... who has been drawn out of the darkness not once but twice now only to be swallowed up again. [The second time Yuuki returned..had been due to Hades involvement. Perhaps the next time it would stick and he'd be the one to bring her out of the darkness himself.] When this person returned she informed me that the situation back home was not as dire as those of us here assume it to be. [It gets rather complicated with all the time travel involved..]

I have every confidence that your friends are fine, and it's only a matter of time before your world is restored or they arrive here.