Cheat Engine

[Gniarf]

Well it's like the health for succubus no tatakai, except that you can't use soul pts as a helper.

So:
1-search for unknown value, type 4bytes, last digit C (noticed how your health and soul pts both ended with C? Same here).
2-spend one point, filter with changed value
3-wait a bit, and do several "unchanged value filters"
4-undo skill pts usage -> changed value
5-spend your points,undo -> changed value (since the pointer changed)
6-Improvise using a mix of steps 2-5...
X-...and well when you only have one result edit [result_address]+5 as a 4byte int, enter desired_value*8