Kuro

Mark didn't know it, but Megumi had actually felt something very serious happen in that moment. Even though Megumi never showed her emotions, that didn't mean she couldn't feel anything. In fact, Megumi tried her best to always be in touch with her emotional side ever since she realized that it was becoming harder and harder to feel.

So whenever she could, Megumi always looked out for her family and those around her. And in that split moment, Megumi noticed that one of the people she had always kept a watch on had vanished.

 Megumi couldn't feel her brother's mana anymore!

 …

[Three Minutes Earlier. On the other side of the island, with Kuro Yoshida [Megumi's Brother.]]