Fate of herine princess: six princess knight

the story take place in a magical castle where the princess was protected by six elemental knight. the six elemental knight was Otsukomo kotori the knight of fire, Yui Hinomiya the knight of water, Yuzu Yukihira the knight of air, Miyano Otha the knight of ice, shino Hyuuga the knight of thunder, shiori Akatskui t...