@Dundun123 I'm not entirely sure myself, but this is my hypothesis:
[ul]
[li]The monster boy represents Hashi. Like Hashi, the boy is lonely because his condition pushes people away.[/li]
[li]The girl represents Hana (the patient with involuntary orgasms). While they clash in real life, Hashi also sees her as someone who could empathize with him because of her own problems.[/li]
[li]The burning town is Hashi pushing people away to avoid being hurt. It's easier to reject everyone rather than experience rejection.[/li]
[li]The boy eating the rampaging specter is Hashi fighting his inner demons. He's not happy being how he is. This probably also represents wish-fulfillment of some kind: If only it were that easy in real life.[/li]
[li]The spirit house is the clinic. The ghost whisperers are the doctors (and possibly the patients as well). The boy is wary of both, but recognizes that they could help him.[/li]
[li]The girl holding the boy's hand at the end could represent romantic or platonic feelings for Hana. I don't think it matters much which, what's important is that the girl is there. She's someone who doesn't abandon him. Again, this is wish-fulfillment, obviously Hashi and Hana don't get along this well in real life and becoming friends isn't as easy as Hana simply being there and accepting him.[/li]
[li]I think what the little guy specifically gets at the end is that the boy and girl are Hashi and Hana, and Hashi's desire to be closer to her. I'm not sure how much he gets beyond that.[/li]
[li]I don't think it's apparent whether Hashi is consciously writing the story as an allegory for himself or not.[/li]
[/ul]