Sachiko is a shy girl that is often very lonely because she secretly fights on her own as the Black Swan Knight.
- The name Sachiko means "happiness, good luck" (幸) (sachi) and "child" (子) (ko).
- Sachiko's surname Tanaka means "field, rice paddy" (田) (ta) and "middle" (中) (naka).
- In the Tecmo Koei's 3D fighting game Dead or Alive 5 Last Round, the character Momiji is dressed as Sachiko Tanaka in the Schoolgirls Strikers Mashup Set, where in the PlayStation 4 and Xbox One versions, she can transform her school uniform into the battle outfit and viceversa via pressing the taunt button, doing a Power Blow or Power Launcher.
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