0-X: Hitokiri no Monogatari

0-X: Hitokiri no Monogatari ("Tale of a slayer") is a 6-part story, 5 by Leila and one by Rey. It is part of the Fabula Mundi Umbra series.

Main Concept
The main concept of the series was to make a story about assassins, where the main characters wouldn't be the heroes, but not really the villains either.

Characters
Main Page: 0-X: Characters

0-X: Hitokiri no Nikki
The first story. It's about a 12 year-old boy seeking revenge, who meets a crazed young man and a rich girl. The two younger kids, 0-Z and 0-Y, only follows the older man's orders... And it will prove to be their worst actions. Has two epilogues, that set up the story for the sequel. The epilogues, however, do not show everything about the story's end.

0-X: Hitokiri no Nikki

X7: Hitokiri no Nikki
The second story. Was supposed to be a unrelated story, but has linked to the rest of the series very quickly. The story is about seven unrelated assassins that kill according to one of the Deadly Sins: Greed, Wrath, Gluttony, Pride, Sloth, Envy and Lust. When the seven of them meet, they create a group of murderers. However, each one of them has separate motivations, including a secret war of wits between two of the members.

X7: Hitokiri no Nikki

0-X: Hitokiri no Sensou
The third story. A famous assassin escaped from the mental asylum, and he's out to kill everyone! The son of the original Midori daughter meets him, and with his two best friends, they create a new group... the 0-XYZ returns! The story introduces many new characters, and solves unanswered questions from the two previous stories. It may be the last story of this arc, but it's surely not the end of the tale.

0-X: Hitokiri no Sensou

X∆: Hitokiri no Nikki
The first side-story.

X∆: Hitokiri no Nikki

X∞: Jigoku no Mahou-Shoujo
The second side-story.

X∞: Jigoku no Mahou-Shoujo

0-X: Hitobashira no Nikki
The last part, which can be considered both a side-story and a part of the main series.

0-X: Hitobashira no Nikki