Hi. I can't recall the title of a manga where the strongest shrine maiden (?) was asked to get rid of one of the three most powerful yōkai (?) who can make stuff disappear by counting, then the yōkai became in love with her and protected her from others.
Dunno about Misha's Siren though. I don't recall enough details about it to have any kind of theory on how it works.
No nullification there, just a regular sound-based attack. Considering that sonic weapons exist even in real life, the least fantastic use of wind magic here.
Ah, finally had the chance to catch up on this as well. Excellent as always so far, hopefully someone will pick this up again (and I wouldn't mind seeing someone translate that other couple's manga as well, they seemed quite nice).