《CHAOS;HEAD Rubu Chu☆Chu!》是由5bp.與Nitroplus聯合製作的女性向戀愛冒險遊戲，最早於2010年3月25日在Xbox 360平台首次推出，作為《CHAOS;HEAD》系列的衍生作品，延續原作的世界觀，並加入更多戀愛與互動要素。隨後，遊戲在2011年1月27日移植至PlayStation Portable（PSP），讓更多掌機玩家能夠體驗這段結合科幻與戀愛的冒險。到2012年11月22日，再次移植到PlayStation 3（PS3），推出普通版以及特別收錄的版本，進一步擴大玩家群體。最終在2014年8月21日，該作也登上PlayStation Vita平台，並與《ChäoS;HEAd NoAH》打包成套裝《ChäoS;HEAd Dual》，以全新組合的方式再次呈現，成為系列粉絲珍藏的重要版本。2025年11月27日，以雙重包組合方式在Switch平台上架。

主角西條拓巳原本是擁有特殊能力「Giga Lomaniax」的少年，但在前作劇情結束後，他失去所有記憶，陷入混亂的心理狀態。背景設定於虛構的渋谷，城市被現實與想像交織的事件所籠罩，將隨著拓巳的視角，探索這個扭曲而迷幻的世界，體驗他與六位「Gigalomaniacs」少女之間的互動與戀愛發展。

劇情上，結合原作的心理懸疑與戀愛冒險元素。拓巳雖擁有超能力，但此刻他渴望過著平凡而充實的生活，努力擺脫孤獨與御宅族身份的束縛。一開始，隨著拓巳回到渋谷，在夏日的城市中重逢六位少女，她們向拓巳揭示遊戲的核心設定——這個世界是拓巳想像出的虛構空間，而要從中逃脫，他必須面對潛藏於世界各處的敵人塞拉·奧格爾。同時，六位女孩對拓巳的愛情情節被具象化成「愛情旗幟」，自由選擇與她們互動，體驗浪漫、幽默甚至帶有輕微挑逗的情節。在故事敘事上維持原作風格，心理懸疑與戀愛劇情交織，使玩家時而陷入緊張的推理氛圍，時而沉浸於甜蜜的戀愛互動。

操作方面，屬於文字冒險（Visual Novel）類型，主要透過選擇選項來影響故事分支與角色互動。加入3D立繪與動畫技術，使角色表情與肢體動作更生動，並搭配全語音演出，增強沉浸感與臨場體驗。隨時與六位主要女角進行互動，開啟浪漫情節，並透過選擇不同的對話或行動，改變與角色的親密度，解鎖不同結局。保留原作心理元素的奇幻與扭曲氛圍，但更著重於戀愛趣味，讓玩家在充滿幻想的世界中享受甜蜜互動。

市場評價方面，儘管是衍生作品，在原作粉絲及戀愛冒險遊戲玩家間獲得高度期待。玩家普遍讚賞遊戲將《CHAOS;HEAD》的心理懸疑元素與戀愛冒險完美結合，既保留原作世界觀的奇幻與扭曲，又帶來輕鬆愉快的互動體驗。3D角色動畫與全語音演出提升沉浸感，使戀愛場景更加生動。部分玩家提到，遊戲節奏偏慢，且劇情中穿插的心理與幻想元素需要一定理解力，但這也正是其吸引原作核心玩家與喜愛戀愛互動的玩家之處。總體而言，《CHAOS;HEAD Rubu Chu☆Chu!》成功地將心理科幻與戀愛模擬融合，為玩家提供既甜蜜又帶有幻想挑戰的沉浸式體驗，無論是原作粉絲還是新玩家，都能在這款遊戲中享受充滿想像力與戀愛趣味的冒險。

“CHAOS;HEAD Rubu Chu☆Chu!” is a romance visual novel co-developed by 5pb. and Nitroplus. It was first released on March 25, 2010, for the Xbox 360 as a spin-off of the CHAOS;HEAD series, extending the original world while introducing more romance and interactive elements. The game was later ported to the PlayStation Portable (PSP) on January 27, 2011, allowing handheld players to experience this blend of science fiction and romance. On November 22, 2012, it was ported again to the PlayStation 3 (PS3), available in both standard and special editions, broadening its reach to a wider audience. Finally, on August 21, 2014, the game arrived on the PlayStation Vita, bundled with ChäoS;HEAd NoAH in the compilation ChäoS;HEAd Dual, becoming a must-have edition for series fans. The game is now scheduled to return on November 27, 2025, with a dual-package release for the Nintendo Switch.

The protagonist, Takumi Nishijou, once a boy gifted with the supernatural ability “Giga Lomaniax,” finds himself having lost all his memories after the conclusion of the original game’s events. Confused and adrift, Takumi becomes entangled once more in Shibuya, a city wrapped in a haze of blurred reality and imagination. Through his eyes, players explore this distorted, dreamlike world while engaging in romance and interactions with six “Gigalomaniacs” heroines.

The narrative blends the psychological suspense of the original game with romantic adventure elements. Although Takumi is endowed with special powers, he now longs for a normal, fulfilling life, struggling to break free from loneliness and his reclusive, otaku tendencies. As summer unfolds in Shibuya, Takumi reunites with six heroines who reveal the core premise: this world is a fictional space born from his own imagination. To escape, he must confront a mysterious enemy, Seira Orgel, hidden somewhere within this fabricated reality. Meanwhile, the heroines’ affection for Takumi manifests as “love flags,” allowing players to freely pursue romantic developments, ranging from sweet and humorous moments to slightly suggestive interactions. The storytelling maintains the original’s unsettling psychological tone, while adding lighthearted and heartwarming romance, creating a unique rhythm of suspense and tenderness.

In terms of gameplay, the title follows the traditional visual novel format, where player choices determine branching storylines and character relationships. Enhanced with 3D character models, expressive animations, and full voice acting, the game offers a heightened sense of immersion. Players can interact freely with the six main heroines, trigger romantic scenarios, and shape Takumi’s fate by selecting different dialogue and actions. While retaining the twisted and fantastical atmosphere of the original, the game leans more heavily into romance and playful interactions, striking a balance between psychological intrigue and lighthearted fun.

As for market reception, even though it is a spin-off, CHAOS;HEAD Rubu Chu☆Chu! has been highly anticipated by both fans of the original and visual novel enthusiasts. Many players praise its successful fusion of CHAOS;HEAD’s psychological suspense with romance, preserving the series’ surreal world while delivering a more relaxed and entertaining experience. The 3D character animations and full voice acting heighten the immersion, making the romantic moments more vivid and impactful. Some note that the pacing can feel slow, and the interplay between psychological themes and fantasy may require attentive understanding, but this very complexity is what appeals to dedicated fans of the original series.

Overall, CHAOS;HEAD Rubu Chu☆Chu! skillfully combines psychological sci-fi with romance simulation, offering players an immersive experience that is at once sweet, imaginative, and emotionally engaging. Whether you’re a long-time follower of the series or a newcomer to the world of Shibuya’s “delusions,” the game provides a unique adventure filled with romance, mystery, and playful charm.