ニッポンには四鬼がいるから
テーマは日本の四季。
舞台は遠い未来、日本人が移民し開拓した惑星シン・ニッポン（形は日本列島）のお話。
「四鬼」と呼ばれるテラフォーミング用マイクロマシン集合体の成れの果てが襲ってくる世界。
四鬼は人型や動植物型、妖異型など様々な形態が存在し、春夏秋冬と鬼節毎に襲ってくるタイプが変化。
変化の原因はテラフォーミングシステムの副次機能である環境再現システムの暴走。
近年は高鬼圧が急激に強まり夏鬼が大暴れ中。
キャラは自ら望んでフルサイボーグ化し機械化人間となった人で賞金稼ぎの浪人、通称 鬼人（機人)
脳の性別は男、睡眠中に身体を女性型疑似人格AIに任せ、サイバー遊郭で小銭稼ぎが出来るという理由で人型少女型。
定期的なメンテナンスは必要なものの、食事も風呂も病気も気にしなくて良い、なんなら敵も戦闘用AIに任せて寝ていたいという人向け。
働きたくないでござる。
羽織ってる着物はサイバー遊郭の常連成金おっさんに貰った八剱重工製和式装甲着物、オプション外装の偏向シールド発生器付き。
下着の上に羽織ってるだけなので色々丸出し、本来は和式装甲行灯袴と上下セット。
得物は石村工業製改造工具武器 、百鬼丸シリーズ・アイザックモデル（サイン入り）の鬼斬丸（プラズマカッター）と鬼破槌（超振動破砕機）、キャッチコピーは「鬼に金棒」
四鬼は元テラフォーミング用の土木機械ゆえに工具を改造した武器に弱く通常武器より効果が大きい反面、安定性に欠け壊れやすいが、安価に修理できるために貧乏な賞金稼ぎに人気。
キャラ周りの物体は雨鬼の残骸、弱点のコアを破壊すると全方位に鋭角な破片を撒き散らし爆散するので防御手段必須。
雨鬼は鬼節や鬼圧によって発生率が変動するだけで四鬼には分類されておらず、亜種に雪鬼(ゆき)タイプが存在。
サイバーニンジャを統括使役するミカドが治める狂都（キョウト）、サイバーサムライが集い生死を掛け技を競い合う刀京（トウキョウ）
超時空エネルギー発電所フジヤマや対鬼ヶ島用決戦兵器 超甲鬼神合体“Mo.Mo.Ta.Ro”などサイバーパンク・ニッポン昔話的雰囲気。
宗教上の理由で尻丸出しだけども、装甲行灯袴を履かせてサイバー日本刀あたり持たせたほうが見栄え良さそう。
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Nippon has four demons.
The theme is the four seasons of Japan.
The story takes place in the distant future on the planet Shin Nippon (in the form of the Japanese archipelago), which Japanese immigrated to and pioneered.
The world is attacked by the fruits of a collection of terraforming micromachines called the "Four Demons.
The four demons come in various forms, including humanoid, animal, plant, and demonoid, and the type of demon that attacks changes with each spring, summer, fall, and winter season.
The cause of the change is the outbreak of the environmental reproduction system, a secondary function of the terraforming system.
In recent years, high demon pressure has increased dramatically, and summer demons are on the rampage.
The character is a person who willingly turned into a full cyborg and became a mechanized human being, a bounty hunter wanderer, a.k.a. Oni-jin (machine man).
His brain gender is male, but he is a humanoid girl because he can earn coins in a cyber brothel by letting a female pseudo-personality AI take care of his body while he sleeps.
Although regular maintenance is required, this is for people who don't need to worry about eating, bathing, or getting sick, and if they want, they can leave their enemies to the combat AI and sleep.
I don't want to work, that I don't.
The kimono she wears is a Japanese-style armored kimono made by Yatsuhara Heavy Industries, which was given to her by an old man who is a regular at a cyber brothel and has a deflector shield generator as an optional exterior.
The kimono is only worn over the underwear, so it is not visible in any way, and originally came as a set with a Japanese-style armored hakama and upper and lower hakama.
His special weapons are a modified tool weapon made by Ishimura Kogyo, an Isaac model of the Hyakkimaru series (with his signature), the Oni-zanmaru (plasma cutter) and the Oni-hazuchi (super vibration crusher), with the catch copy "Oni ni kanabou (a metal rod for demons).
The four demons were originally used as terraforming machines, so they are vulnerable to weapons modified from tools and more effective than ordinary weapons, but they lack stability and break easily.
The objects around the character are the remnants of rain demons. If the weak core is destroyed, sharp-edged shrapnel will scatter in all directions and explode, so defensive measures are essential.
The rain demon is not classified as one of the four demons, only its rate of occurrence fluctuates depending on the demon's section and pressure, and a snow demon (yuki) type exists as a subspecies.
There is also Kyouto, where cyber ninjas are ruled by Mikado, a cyber ninja commander; Toukyou, where cyber samurai gather to compete in life-and-death combat; and Fujikyo, a super-space energy power plant.
The atmosphere is reminiscent of a cyberpunk Japanese folktale, with such features as Fujiyama, a super space-time energy power plant, and Mo.Mo.Ta.Ro, a decisive battle weapon against Onigashima, a super-armored demon god.
Although her buttocks are bare for religious reasons, it would look better if she were to wear armored hakama and carry a cyber Japanese sword.