Fault Milestone One

Fault Milestone One was developed by Alice in Dissonance as the first work under Project Written, the name of their operations. It was directed and written by Munisix, with character designs and other art by Hare Konatsu. The "Milestone" in the title comes from how Alice in Dissonance wanted to do something different from the commonly used word "Episode"; as the story is about a journey, they found "Milestone" thematically fitting. While Munisix is a native speaker of English, he chose to write the game in Japanese, stating that his reason for this was that he had had more exposure to the visual novel medium in Japanese than in English, also saying that he would have used English if he were to write a movie script.

According to him, the writing is the aspect that takes the most time during the production, with a lot of time spent on coming up with ideas and turning them into "something consistent". Describing himself as a disorganized person, he has said that they have had to delete whole segments due to him overlooking some aspect of the game's world.

According to Munisix, the game was a commercial success, with the series selling over 480,000 copies by September 2019. The Steam release had an estimated total of 108,000 players by July 2018. It was met by a wide range of reviews, with some critical and some positive. Jenni Lada at PC Gamer included the game on a list of "the best visual novels for beginners".

Geoff Thew at Hardcore Gamer was disappointed with the lack of player choices, saying that experimenting with various consequences is "the whole draw of visual novels"; for visual novels without branching stories, he thought that puzzle gameplay mechanics are required to keep the player interested, and that without either, it could have instead been a manga or light novel. Andrew Barker at RPGFan questioned why the single player choice was included, calling it pointless and "almost a tease for players wishing they had more control over the events". Thew called the artwork lackluster, with the world and characters looking "ugly and flat"; he liked the shading, but said that the proportions are off for most characters, particularly the men, and that perspective is handled incorrectly. Barker said that the presentation felt low-budget: he called the character design excellent, with elegant character artwork, but found the background art and music to be dull and lifeless.