How To Go To Another World Demo

Believing that everyone hated him and that his life was already ruined, the protagonist one day comes across a suspicious document titled "How to Go to Another World".
Thinking it was fake, he decided to try it using an elevator—only to really arrive in another world.

While exploring what seems to be a strange underground facility, he stumbles upon a videotape containing a message from an unknown person.
Where is this place?
Who recorded the video, and what is happening here?

This demo allows you to experience the first chapter (approximately 20-30 minutes of gameplay) and includes [parts of the game system/levels/story]. The full version will include the rest of the story and additional levels.