So it was all just a metaphor for internal homophobia, huh.

I love works that can be both taken at face value or interpreted in many different ways, including ways that weren't originally intended by the author.

At example my first impression was that the ghosts were a metaphor for intrusive thoughts (the more attention you give them, the more they appear) and Kagari was a manifestation of the protagonist's OCD.

I had a similar thought! Kagari's love is "scary" because accepting the ghosts (intrusive thoughts) around her is scary. Acknowledging that her thoughts can't hurt her is momentous task, but since Kagari is the only one who can "touch" her (and that touch doesn't hurt Ageha) there comes her relief.

Eventually, I think both the ghosts and Kagari will stay full time when she's truly able to let her thoughts pass / not be bothered anymore. Kagari knows Ageha's thoughts aren't her and don't make her a bad person. This and the queer allegory made the oneshot almost comforting, I just love Yuri so muchhh :')