As usual: 300 Power Stones = 1 R-18 chapter.
This round's deal: 600 Stones = 2 R-18 chapters.
For clarity: There are already 200 power stones on this novel before this goal which were for the previous Chapter. So the new ones start from 201...202 and so on.
đ Progress Counter: 120 / 600
That's the number you should keep in mind. Don't get confused.
The pounding awaits~