Sumireko Hanabusa (英 純恋子) is a former student of the Black Class who was in a competition with the other students of that class who were trying to kill Haru Ichinose where the reward is anything what that assassin may want. As a reward, she simply wanted to kill Haru and prove that she was the strongest queen.
In the final episode, it's shown that she is back in her mansion in good condition.
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