Mystic Square Explained

It's no secret I love Mystic Square. I personally consider it to be the game that has the best plot out of the entire Touhou series, so much so that I feel that the genius plot-twist of the game goes completely unnoticed by the majority of Touhou fans. To rectify that, I've provided my personal interpretation of the plot behind Mystic Square.

Prop credits
Hands, Gohei by Ceej39
Soft shadow by Rumiflan
Crossed Arms by Tsukune429
Tower, Makai, Bent Elbow by Reimu-and-Cirno
Inverted Darkness, Darkness Pillar by rsgmaker
Tears by Scarlet-the-Leafeon