Here's my translation of the Character and Story descriptions of the 360 mode on Cave's website (the story can also be found in the artbook):
http://www.cave.co.jp/gameonline/Xbox36 ... ew360mode/
Character
Saya, CV: Aya Hirano
Element Doll Extra Z-002 / Saya
The ultimate Element Doll was made at the Element Doll Electronics Laboratory through experimentation and research.
Hibachi was also constructed around the same time. Saya was instructed to serve her master like any other element doll after the experiment was discontinued.
However, with the emergence of Hibachi, Saya received the special order to repel Hibachi.
Pretty without childish appearance, while maintaining a perfect face-to-face smile.
The inner feelings were intended to be concealed however, the system was unfortunately not aware of the fact that Saya’s real intentions were leaking out.
She was also confused by Hibachi’s sudden betrayal as they had spent time as sisters. Saya can therefore not forgive Hibachi for attacking their companions.
Likes
Mad teddy & Mad bunny
Dislikes
Hibachi
Hibachi (Hina), CV: Aoi Yudai
Boss: Old Element Doll Extra Z-001 / Hina
Friendly, seems to have a bright personality and is always smiling.
In addition, she always thinks that she should give her utmost against her opponents.
As for her past, the ultimate element doll was made through experimentation at the Element Doll Electronics Laboratory.
The manufacturing concept was that they thought that it would the first of the human race to “help as much as it can”.
However, the answer fell into the paradox of “eliminating the human person” after the experimentation had been aborted and she was then frozen.
Likes
Life, organisms, plants, flowers in particular
Dislikes
Not making peace, poison
Story
Element Doll Electronics Laboratory.
That’s where the manufacture took place in regards to the research and experimentation of creating the ultimate Element Doll.
Project ”Haruurara”
The manufacturing concept was that they thought that it would the first of the human race to “help as much as it can”.
The first units were created through the passion and effort of the researchers, after having drafted the blueprints for many years.
“Extra Z-001” and “Extra Z-002”. The two bodies were named “Hina” and “Saya”.
They were believed to be the first of humanity to be taught that it was highly important to spend time closely with humans. The two bodies got to spend time together as sisters each day, under the supervision of the chief researcher.
In order to serve their master as the Element Doll while at the same time enhancing their combat capabilities, they were put under the assumption that they were each other’s enemies for virtual training purposes.
However, the outcome of project ”Haruurara” lead to a state of emergency. Hina deduced that the answer was that things had fallen into the paradox of “eliminating the human person”.
The experiments were immediately canceled and Hina was about to be frozen.
Saya was also recovered in the laboratory and the activities for the data analysis were stopped.
However, an incident occurred.
Suddenly, haywire. And destruction.
The “entire” laboratory blew up. Hina suppressed that appearance.
(I assume that her special “appearance” was the cause for the explosion but that in the end, she was able to suppress it)
A few years later...
Mechanized planet people invades and the DoDonPachi corps proceeds to fight back, prepared to fight to the death.
However, a person saw.
Someone led the mechanized planet people.
”Why? Why is this??? I won’t allow it… All of you who plundered… I will never forgive you!”
Saya was tasked with the mission to shoot down the enemy boss, ”Hibachi”.
”Master’s enemy is my enemy. I will kill.”
Fate crossed Saya’s and Hina’s paths once again but what will remain in the end..?