Here is an overview of the game, via its Steam page:

BOKURA is a puzzle adventure game for two players only.

Each player will be two boys who have run away from home, and move forward toward “somewhere far.”

There are many stages ahead of them that can only be overcome by their cooperation. By solving gimmicks that require inspiration, ingenuity, and communication, and capturing the stage, you can experience the story of two boys running away from home.

“I’m going somewhere far away, will you come too?”

The boy nodded. I wanted to know how far “somewhere far” is.

Watch a new trailer below.