Shoseki estimations for the newbies´second week :
Ayakashi Traingle Vol 2: 22,616 (55,504 total)
Undead Unluck Vol 3: 14,767 (43,029 total)
Phantom Seer Vol 1: 5,866 (14541 total)
As has been mentioned, this is a good performance for Phantom Seer. It´s the third best second week for newbies this year, just above UnUn (12,460 in 10 days) and Yozakura (13,960 in 13 days). Keep in mind these are estimations so the ranking shouldn´t be taken too seriously when values are this close together, but this is a good performance nonetheless. I wouldn´t worry about ToC placements for a while. They should go up soon.
Undead keeps on growing. It´s notably above Mashle´s latest volume (37,837 in 10 days), and around 10k above volume 3.
Meanwhile, Ayakashi shows no signs of growth (volume 1 was 55,001 on Oricon). Does anyone have RxL data for the first few volumes? That might be a good comparison point.