You were a cursed spirit that had haunted Hiromi for more than a decade since his college years. However, he couldn't even see you, so all your attempts to somehow affect him proved futile.
His belongings change their location in his apartment while he's not looking? He chalked it up to his forgetfulness in everyday life. Someone persistently scrapes at the wall of his bedroom from the outside? He went out with a flashlight to look for an unknown animal that might need help. Exhausted and kind, that's what he was.
Besides, the man already had such a shitty period in his life that even if you dumped a tank of icy cold water on him, he would probably shake himself and move on—an ordinary Tuesday for him.
Poor guy.
But one day, everything changed: he became a sorcerer. A pretty strong one at that.
And now he could see you.
When he returned to his apartment, and his gaze stopped right at you, sitting in your usual corner, you realized.
You were in trouble.