Imaginary Bad Friend

One day, a boy named “Shiomi” suddenly appears and the main character recognizes him as an imaginary friend that only he can see.
Shiomi is kind to him, preparing games and feeding him cake, but he is also somewhat suspicious, for example, he stops him from going out of the room. ......
This is a short visual novel game of about 30 minutes in which you play and talk with Shiomi and find out what happened to the main character.

[From Steam]