There's not much to see with Betobeto-san because, well, there's nothing to see, only hear. Betobeto-san is an invisible yokai that follows people at night, making the sound of footsteps.
As this is the case, I couldn't do a visual representation of Betobeto-san, but I have something better. For the best effect, turn up the volume on your computer speakers, then click on the play button and slowly walk away from your computer. That should offer a fairly accurate representation of Betobeto-san. Should something actually appear behind you though, don't hold me liable—that is not Betobeto-san.