Being pressed down by a ghost is a type of haunting phenomenon.
It's generally the lowest level of spiritual encounter, a manifestation of a Wandering Soul's mischief, which doesn't cause any substantial harm to ordinary people.
Kamiyagawa had experienced several of these low-level haunting incidents recently.
Apart from feeling as if a whole bunch of spectral "brothers" were watching him sleep, these last few days, Kamiyagawa occasionally saw fleeting, incomplete ghostly figures and heard odd, illusionary whispers.
The night before last, when he was returning home from his part-time job at the convenience store, he even ran into a ghost hitting the wall.
Such a high frequency of hauntings was definitely related to the supercharged curse that Hanako had cast on him.
[Your existence will incite a carnival of Strange Tale ghosts and goblins; they are being doubly attracted to you.]
Hanako's curse was effective in reality as well.