基礎知識
http://wikiwiki.2-d.jp/VenusBlood-RAGNAROK-/index.php?cmd=read&;page=%E5%9F%BA%E7%A4%8E%E7%9F%A5%E8%AD%98&word=%E8%87%B4%E5%91%BD%E5%BF%85%E6%AE%BA