I have been waiting for this single for so long (now I’m waiting for Blaze because I hate it so much and Wheel of Fortune for the live action Higurashi movie). The ED grew on me too. But I like this better. Yakusoku no Uta is okay, not as good as Tabi no Tochuu though.
While Tabi no Tochuu doesn’t have the Erinyes effect (sounding completly diffrent then you wanted it to…The full version of Erinyes sounded like some gypsy song or something) it does sound less tragic and sad for some parts but then in others it sounds just as haunting and wonderful.