Inspiration source game: The House of Strange Tales
Inspiration and game development are not necessarily the same, it just comes from watching a few related videos.
The main plot of the text is the brother's morbid love for his sister. The brother is Kaitan, and the sister is an ordinary human being who is favored by Kaitan.
The extra chapter is a reversal, and the brother is a weird story derived from his sister's paranoid love.
Still a short article
Concept: Love transcends species (cough)