Sweets Heroic Spirit

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The self-appointed title of Cas-ko (Blue Caster).
Forget about hiding your true name, or proving the existence of your soul, or becoming your Master’s faithful weapon.
“Sweets Spirit” is what Cas-ko calls the heroic spirits who live for amusement and fun in the name of romance and love and happiness.
To Cas-ko surviving to the end and winning the Holy Grail War is no more than a bonus, and it would appear that her true mission is to bring happiness and good fortune to her master.

Fate/EXTRA Material: Encyclopedia of Fate/EXTRA