Neptunia: Sisters VS Sisters 衍生作品——《爆馳次元 戰機少女 VS 巨神史萊犬》（Bakusou Jigen Neptunia VS Kyoshin Slyne）是一款結合競速與動作元素的外傳遊戲，登上 Nintendo Switch、PlayStation 4 與 PlayStation 5 平台，延續「戰機少女」系列一貫的搞笑風格與角色魅力，但玩法大幅轉向全新體驗。

舞台並非熟悉的「遊戲業界（ゲイムギョウ界）」，而是一個充滿謎團的異次元世界。在這個空間中，大量名為「史萊犬（スライヌ）」的奇特生物瘋狂湧現，幾乎淹沒整片大地。為了逃離這個危險的異世界，一名少女騎上機車，展開尋找出口的冒險，而「うずめ（Uzume）」與四女神也將加入戰局，展開一場充滿混亂與競爭的對抗。

核心玩法圍繞「收集史萊犬」展開。玩家需要在關卡中高速移動，運用靈活的駕駛技巧，在廣闊場景中搶先收集目標。除了單純競速，還可以利用各種機關進行攔截、搶奪與干擾，讓整體節奏更偏向動作對戰而非傳統賽車。

每位角色都能騎乘機車進行戰鬥與探索，依照自己的遊玩風格自由改裝機車性能，例如速度、操控與特殊能力，打造最適合自己的專屬載具。這種「競速＋收集＋對抗」的混合玩法，是本作最大的特色。

此外，也保留系列粉絲喜愛的要素，包括全3D演出劇情與角色互動橋段，讓玩家能欣賞角色們在異世界中的活躍表現。各式各樣造型奇特、充滿惡搞意味的史萊犬也會登場，收集全種類成為另一項重要目標。

整體而言，《爆馳次元 戰機少女 VS 巨神史萊犬》是一款節奏明快、風格輕鬆的外傳作品。它將《戰機少女》系列從RPG轉變為偏向競速與動作的玩法，帶來截然不同但依然充滿娛樂性的遊戲體驗，特別適合喜歡角色魅力與輕鬆遊戲氛圍的玩家。

Bakusou Jigen Neptunia VS Kyoshin Slyne (Neptunia: Riders VS Giant Slime) is a spin-off entry in the Neptunia series that blends high-speed racing with action gameplay. It is available on Nintendo Switch, PlayStation 4, and PlayStation 5.

Unlike the mainline titles set in Gamindustri, this game takes place in a mysterious alternate dimension. In this strange world, countless creatures known as “Slynes” have appeared and are rapidly covering the land. To escape, a lone girl sets out on a motorcycle to search for an exit, soon joined by Uzume and the four goddesses, leading to a chaotic and competitive adventure.

The core gameplay revolves around collecting Slynes scattered across each stage. Players must ride at high speed, using skillful driving techniques to gather them efficiently. Beyond simple racing, the game incorporates action elements such as intercepting rivals, stealing targets, and using environmental gimmicks to gain the upper hand. This creates a dynamic mix of racing, collection, and light combat.

Each character rides a customizable motorcycle, allowing players to adjust performance aspects like speed, handling, and special abilities to match their preferred playstyle. This customization system adds depth and replayability to the gameplay.

The game also retains the series’ signature charm through fully rendered 3D story scenes and character interactions. A wide variety of quirky and humorous Slynes appear throughout the game, encouraging players to collect them all.

Overall, Bakusou Jigen Neptunia VS Kyoshin Slyne offers a fresh take on the Neptunia franchise by shifting from traditional RPG mechanics to a fast-paced racing-action hybrid, while still preserving the humor and personality that fans love.