Crossplay

Is Schrödinger's Call crossplay?

Crossplay does not apply to Schrödinger's Call: it has no online multiplayer.

I am Mary. The last person in the world you'll ever talk to. Schrodinger's Call" is an adventure game that uses a mysterious phone to connect with souls who cannot die. The main character, Mary, wakes up in a strange room with no memory. The player, along with the bewildered Mary, will save souls.