Kazumi Mizushima and her sisters lived a life of luxury with her stepmother and their servants.
Since they came into their household, their lives has been peaceful and merry.
One day though, a certain event suddenly shook the pillars of their peaceful lives and put themselves in danger.
A certain man suddenly appeared in front of them though, and came to defend the peace they always had.
Who is he, what is his purpose and what is the mysterious background behind the sisters that they never knew before?
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