If A came out, does that mean S also has a chance...?

I honestly wondered if the 'Black Something's Heart Jewel' would actually drop, so I'm glad to know it can appear, but is 7% for an A rank not low? I thought for a second, then checked my S+ units and realized they only have 8%, so it's actually quite high~. By the way, you can exchange as many of these Heart Jewels as you want if you work hard on the Awakening Thousand Mile Journey, so there's no real need to force yourself to get them through Shield Break (but I will anyway). And for the Soul of Power, I got tired of dealing with the firepower, so I used it on the Azure Dragon King. It eats up a lot of gold, and the speed adjustment also got a bit complicated lol. But I feel like my farming and Shield Break runs have become more stable.