《項圈 × 惡意 for Nintendo Switch》（日文名：カラー×マリス，英文名：Collar × Malice）是由Otomate（IDEA FACTORY）開發、Aksys Games發行的女性向懸疑戀愛冒險遊戲。最初於2016年在PlayStation Vita平台推出，Switch版本則於2020 年移植發行，主要是為讓更多玩家能在新世代主機上體驗這款融合懸疑推理與戀愛劇情的經典作品。

相較於一般單純的戀愛題材，在劇情深度與社會議題探討上顯得格外出色。背景設定在虛構的日本新宿區，一場名為「X-Day事件」的連環殺人案震驚全國，導致該區被全面封鎖，治安混亂、信任崩潰。女主角「星野市香（Hoshino Ichika）」是年輕的警察，在一次巡邏中意外遭人襲擊，醒來後發現自己被強行戴上神秘的毒項圈，並收到威脅信件，捲入這起與恐怖組織「Adonis」有關的重大事件。

故事從這起襲擊事件開始展開，必須在不知敵我、不斷遭受威脅的情況下，與一群退職刑警組成的「非官方調查小組」合作，逐步揭開事件背後的真相。這五位男主角性格迥異，各自有著悲傷過去與隱藏秘密，在追查真相的同時，也會逐步與其中一人建立感情連結。戀愛與懸疑的雙線敘事，使劇情張力與情感鋪陳兼具。

操作承襲Vita時期的直觀系統，透過選擇對話選項、調查畫面場景與查閱資料庫來推進劇情。因應主機差異，針對操作介面做優化，支援觸控螢幕與Joy-Con操作，自由選擇以手持或TV模式遊玩。介面設計簡潔易懂，文字顯示清晰，並搭配全語音演出（除了女主角外），提升劇情沉浸感。

音樂與美術是大亮點。配樂氣氛營造得宜，從緊張懸疑的偵查場面到細膩動人的情感刻畫皆有出色表現。角色立繪與CG畫面風格精緻，色調略帶灰暗與冷冽，符合都市犯罪與心理劇的基調。

在市場評價方面，自推出以來即廣受好評，被認為是近年乙女遊戲中劇情最成熟、最有社會深度的一作。Switch版本推出後再次受到玩家與評論家的肯定，特別讚賞其故事結構緊湊、角色塑造立體，與其他同類型遊戲相比具備更多懸疑推理成分，能吸引不僅是戀愛遊戲愛好者，甚至是喜愛刑偵與心理劇的玩家。然而也有部分玩家指出，真相路線（True Route）開啟條件較為繁瑣，需多次重玩才能完整體驗整個故事，有可能對新玩家造成挫折感。

總體而言，是劇情主導、融合懸疑與戀愛的佳作，其獨特的世界觀、深刻的社會議題探討、緊湊的節奏與多層次角色互動，讓它成為乙女遊戲中少見兼具娛樂性與思想深度的作品。對於想尋找有情節厚度、角色真實感強烈的戀愛冒險遊戲的玩家而言，絕對值得一試。

"Collar × Malice for Nintendo Switch" (Japanese title: カラー×マリス) is a suspenseful romance visual novel developed by Otomate (a brand under IDEA FACTORY) and published by Aksys Games. Originally released in 2016 for the PlayStation Vita, the game was later ported to the Nintendo Switch in 2020 to allow a broader audience to experience this acclaimed title on a newer console. Blending gripping suspense with heartfelt romance, Collar × Malice stands out as a classic in the otome genre.

Unlike traditional romance-focused games, Collar × Malice distinguishes itself with a deep and socially charged narrative. Set in a fictional version of Shinjuku, Tokyo, the story unfolds in the aftermath of the "X-Day Incidents"—a series of brutal terrorist murders that plunge the district into chaos and lockdown. The protagonist, Ichika Hoshino, is a young police officer who, during a routine patrol, is attacked and wakes to find a mysterious, lethal collar affixed to her neck. Along with the collar, she receives a threatening letter that draws her into a massive conspiracy involving a terrorist group known as Adonis.

From this moment, Ichika is forced to navigate a world where allies and enemies blur. Teaming up with a group of former police officers who have formed an unofficial investigation unit, she begins unraveling the truth behind Adonis and their sinister plot. The five male leads each carry unique personalities, tragic pasts, and hidden motives, and as the investigation progresses, Ichika can develop a romantic connection with one of them. The game skillfully balances dual storylines of suspense and romance, creating a narrative that is both emotionally engaging and dramatically intense.

Gameplay mechanics follow the intuitive format popularized on the PS Vita, allowing players to make dialogue choices, investigate scenes, and access a detailed database to progress the story. The Switch version introduces interface optimizations, including touch screen support and compatibility with Joy-Con controls, giving players the freedom to play in handheld or TV mode. The user interface is clean and accessible, with clear text and full voice acting for all characters except the protagonist, enhancing immersion.

Music and visual presentation are also major highlights. The atmospheric soundtrack perfectly matches the shifting tones of the story, from tense investigations to tender emotional moments. The character illustrations and CGs are highly polished, with a cool, slightly desaturated color palette that reinforces the urban crime and psychological drama themes.

Critically, Collar × Malice has been widely praised since its original release and is often regarded as one of the most narratively mature and socially thoughtful titles in the otome genre. The Nintendo Switch version received renewed acclaim for its tightly constructed story, multidimensional characters, and emphasis on suspenseful storytelling, which appeals not only to romance fans but also to players who enjoy crime fiction and psychological thrillers. However, some players noted that unlocking the game’s True Route can be somewhat tedious, requiring multiple playthroughs to fully experience the complete narrative, which may be daunting for newcomers.

Overall, Collar × Malice is a standout story-driven romance visual novel that successfully combines emotional depth with a compelling mystery. Its unique setting, exploration of societal issues, fast-paced plot, and complex character dynamics make it a rare example of an otome game that offers both entertainment and substance. For players seeking a romantic adventure with a strong narrative and believable characters, Collar × Malice is undoubtedly worth playing.