Honestly, excluding Phantom Seer that basically doubled the sales of first volume with just 1 more day, the rest is all kinda underwhelming:
Phantom Seer #1 (8,675) - 3 Days
Phantom Seer #2 (16.558) - 4 Days
Hard-Boiled Cop & Dolphin #1 (7,307) - 5 Days
Hard-Boiled Cop & Dolphin #2 (6.550) - 4 Days
Me & Roboco #01 (8,637) - 5 Days
Me & Roboco #2 (10.645) - 4 Days
Kokosei Kazoku #1 (3.636) - 4 Days
C&D is basically pulling the Magu-chan like i mentioned earlier, doing around the same with 1 day less, slightly selling less, Roboco is doing "better" but is pratically selling the same and Kokosei sold even less than i thought, didn't crack the 4k club of the other gag series