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Sword of Damocles (ダモクレスの剣, Damokuresu no Tsurugi) is the symbol of the Kings.

The sword shows the truest image of its King’s condition.

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       The title ‘King of Fire’ indeed suits you well. Burning up into ashes without purpose.
The name ‘King of Order’ suits you fine too. Trying to meddle with other people’s lives with your long and boring lectures. 

Shiro:  sunflower – adoration, “I only have eyes for you.”
Kuroh: marguerite – faith, true love, love fortune-telling.
Misaki: lily of the valley – purity, humility, happiness comes again.
Saruhiko: forget-me-not – true love, “forget me not.”
Reisi:   blue rose – dream come true, impossibility, miracle, god’s blessings.
Mikoto: red rose – affection, beauty, passion, ardent love, “I love you.”

source: official twitter | language of flowers in Japan