So Amazon lists the two volumes for sale,for ¥935 a piece(or ¥1870 for the kindle),how many chapters actually make up a volume is unclear,if we assume 12,then there should be 24 chapters in total.
They state 124 pages for volume one,if we say four are for the covers,then the remaining 120 with 10 pages each would be 12 chapters.
Now we just need someone to come along and mop it up.