I love 2 Hour Vacation. My favorite song of this era. I can't believe she actually surprised me by collaborating with someone. Because she's only ever done it like once on one of her albums I didn't even think about her doing it.
Zetsumetsu Kurokami Shoujo is the debut single of NMB48, it debuted at number 1 with 219k copies sold. Not bad for a debut I guess? states Suilen. I agree, in fact it's probably the second best debut song here.