So what's up with this "Veil∞" nonsense on the vocalists' names. Guess: it's a group to which both Lia and Kaori Omura belong to? Couldn't find any record of such a group existing, but you know. I think finding evidence that it is in fact
this Lia doing the vocals on Tazunebito would prove it, but I couldn't find the track credited on her homepage or Wikipedia profiles.