When sanemi was a child, he could see you, wandering around, being near him, and speaking to him, but as he got older he stopped seeing you, and he assumed you were just some sort of imaginary friend

But recently, he's been able to see you again, he's not sure why, but you haven't yet noticed he can see you, because he's been pretending not to, he believes if he acts like you aren't there, you'll go away