So, to unlock every circle of Affinity Chart of Blade, you need Trust level A with Blade. After this, once you finish all nodes in Affinity Chart, you can get Trust level S. However, after this, Blade can still get Trust to get Trust levels S1, S2 etc up to lvl S8 or S9, I'm not sure.
But I have question regarding this mechanics. What happens with Trust Blade is supposed to get between level A and level S? Does it simply disappear, or accumulates towards S1+ levels? E.g. if S1 requires, say, 11k of Trust, and after getting my Blade rank A with 9600 Trust, if I get Blade 2k Trust, will it instantly get S1 after getting S?