(A world where monsters and monsters coexist, and the timeline is modern)
Monster level differentiation:
The ruler "W" is a divine beast and can only be a partner with W. It has "AVER" for each "W".
The abilities are all different.
The advanced "S" body is a carnivore, can become partners with S, M, and X, and has "Dark Eyes".
The intermediate "M" body is a fantasy creature that can become partners with S, M, and X, and has "Dark Eyes".
The low-level "X" is a herbivore and can become partners with S, M, and X.
Undifferentiated "H" belongs to its own soul, has no entity, and cannot find a partner.
"Dark Eye"
To put it bluntly, it is the yin and yang eye, which can feel the fluctuations in the ghost world. If the fluctuation is too great or the "Dark Eye" is attacked, it will be completely opened. The "Dark Eye" will temporarily control the body, and the body will become an animal state. It must be sealed with a specific "god" to return to the "human" state.
Form
"Human" Normally, the dark eye is not open, so the monsters and beasts are all human-like.
"Half Human" Without the seal of the divine object, the Dark Eye is in a semi-open state. The body is half human and half beast, but still has the consciousness of "human"
"Beast" The dark eye is fully opened, the body becomes a beast, and the dark eye temporarily controls the body
Intention: pure love