So it's end on the status quo hum.
But let's be real here, the dude has all the chances to end with her senpai. He's literally competing (if we can call it a competition) with a ghost. A ghost, her senpai can't see, hear and feel it. Literally, she has zero chance.
It's not a love triangle.
The only person the ghost can communicate with is the dude, and it's not even trying to convey her love to the senpai. It's a one dude, two girls stories.
"But it's for the lols" yeah yeah, but it's not that funny for a rom-com.
At least it only length 3 chapters.