It take time, but not really hard. You can get around 3-4 AP per full day of average speed.
Actually, Inazuma would already get it if he didn't start from lv 170. (need to raise to 180 first before he get any AP)
And btw, the higher level you want to upgrade other skill = the more you need per level also. For example, you need only 2 AP to unlock first PA+ but then it will cost 3 AP for the next PA+ upgrade for the same weapon, then with 4 AP of the 3rd upgrade, 5 AP for the 4th upgrade...
So it is more than 10 AP needed if you want to have lv 50 slicer still.
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