You can read this on MangaRock. It’s a manga that’s a prequel to a game, which is the original source. There’s also a novel adaptation that feels more completed overall. Check the two out, especially the game’s mv version, the newest edition. It was made fairly decently and probably one of the best indie games ever made.
It’s fitting that the mangaka infamous for their bittersweet endings would draw this piece. This manga ends right where the game started and gives a detailed image of the lives of the two main characters in the game before it started. It did a good job of painting the two’s motivation and past life without deliberately villianizing or heroizing any of them, as deeply in their hearts they are two different people who viewed the world in their own way. It’s so good, I won’t admit the pacing is perfect though, but for anyone seeking for more story of the game, this manga did its job well.
Because the game was made recently, it gives me hope that there would be a continuity to the whole story. The game, manga and novel is just shy of being a perfect work of art.
TLDR; Highly recommend this for anyone looking for a good horror story with great art and a deep lore.