Azami

Azami is the source of the appearance of eye abilities for those who experience near-death moments, existing within a parallel dimension she had created to escape the real world with her husband and daughter and live forever. However, after an attack on her home and the capture of her husband, she retreated into the dimension, known as Heat Haze, where she would be imprisoned by a rebellious and sentient snake under her control.

She eventually gives her Combining Eyes and control over Heat Haze to her grandaughter, Marry, to allow her to escape after she was trapped in Heat Haze by Azami to save her from death.

It was created by Azami's very first desire and wish to know and understand who she is. Because of this, it serves its master's current biggest wish and has a wide degree of knowledge. When Azami's biggest wish changed from the one that created it, it rebelled by tricking her into trapping herself into the Kagerou Daze. It then began its plans to force the next Medusa, Azami's granddaughter Marry, to rewind the world. It is thus the reason for the various Routes, which all end when it possesses Konoha and kills various Mekakushi Dan members.