The seme is brown haired, wears a green jacket and learns "magic" from grandma, because he sees ghost and flying little things in the air.

There was a ghost somewhere and they called this other person, office worker, blond guy, glasses, with a new mobile application against ghosts but the sound of it upsets the ghost and attacks the guys body.

Then the ghost agrees with the seme that he leaves the body foryouknowwhat.

But somehow still returns. The last thing I remember is this seme guy sharing his powers with this office worker to save him and then he starts to see the floating little beings and ghosts in the room.

Been searching for hours, just registered because of it lol, curious what happened,
Thank you for your help!

Just came across this post. Sorry for the lack of a reply, until now.

It's I'd Rather Believe.