姉なるもの (Series) favorite_border

[DeepL Translation - needs review] Volume 1 Introduction: One day, Yu, a boy who lives alone in the world, meets something beautiful and blasphemous. One day, he met something beautiful and blasphemous, called "Ito," a black goat from the forest pregnant with a thousand kids. Then "It" changes her name to "Senya" and becomes his sister--?　The first volume of "Sis Narimono," which depicts the love between a sister and brother in the farthest reaches of the Cthulhu Mythos, is now on sale.

(Translator: DeepL)