The girls with no significant others.
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The Last Blade (幕末浪漫 月華の剣士, Bakumatsu Roman: Gekka no Kenshi?, “Romance of the Bakumatsu: The Swordsman of Moonlight”) Not 月下の剣士、Swordsmen Under the Moon.
Refer to this Link http://www.sydlexia.com/moonwalker.htm