The seventh nurse with the worst personality is the black-hearted nurse, Kiritani.

Kiritani is Yamada’s new nurse, and unlike his previous nurses, she treats him with kindness and affection. Yamada thought his turbulent days were over, but Kurokawa, his second nurse, tells him that Kiritani is a ruthless former delinquent who harasses people. However, Yamada didn’t believe anything Kurowaka said, as he was unable to believe that sweet Kiritani could be a wicked person. However, Yamada didn’t believe anything Kurowaka said, as he was unable to imagine that Kiritani, a kind-hearted nurse, could be a wicked person.

Later, he would come to realize that Kiritani does have a black heart.