Hiyori's ultimate form that transforms using the Four Sparkling Key created by channeling the energies of Aiyo, Senzuku and Yuzuki into Hiyori using Ruka's ability.
It is the powerful form that combined the powers of Aiyo, Senzuku, Yuzuki and Hiyori themselves.
By activating the Four Sparkling Key, she can activate weapons, abilities and special abilities that imitate each one.
The overwhelming fighting ability of the Four Sparkling Key pushes aside the darkness that stands in the way and transforms it into an embodiment of light.