My Four Prices

The truth is scattered in the memories of four "I"s. And when the clouds came over and their consciousness flipped in the abyss, they suddenly discovered that they were being pushed into the whirlpool of the same fate by some kind of force. If the four "I's" cannot piece together the complete truth, then who exactly disappeared. That calico cat waiting in the snow, which Kurokawa Shisei is it waiting for? Or is it waiting for all of them?