D4 (ディーフォー?) is the only woman working under McPherson. She defeats Taisuke's group on her own in their first encounter and before Nami used her powers she never received a single wound. This heavily affected her mind causing her to develop a rivalry with Nami. In page 17 of chapter 71, D4 daydreams about a happy scene in which McPherson calls her by her real name, Emma (はエマ?), which is revealed by the poet

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