《真紅之焰 真田忍法帳》（日語：真紅の焔 真田忍法帳）是由知名女性向遊戲品牌「Otomate」製作的戀愛冒險作品，最初於2018年在PlayStation Vita平台推出，並於2024年2月15日以移植形式登上Nintendo Switch，作為「Otomate Graffiti」企劃中的首批作品之一。以戰國末期的大坂之陣為背景，將歷史與虛構巧妙融合，呈現出一段跨越生死的情感故事。

劇情設定於關原之戰結束十四年後，天下尚未穩定的時代，主角年輕的女性忍者望月六實，為替戰死的父親報仇，效忠於仍在抵抗德川政權的真田信繁（又名真田幸村）。將隨著她一同進入真田十勇士的世界，經歷任務、戰爭與抉擇，在戰亂與陰影中尋找愛與忠誠的意義。與信繁及其麾下的十名忠義武士互動的過程中，主角的情感也會逐步發展，形成多條支線與戀愛路線，每一段關係都帶有不同的歷史背景與心理層面。遊戲劇情帶有濃厚的悲壯與宿命感，戀愛描寫細膩而克制，更多強調情感積累與共同信念，而非單純的甜蜜愛戀。

操作上，作為戀愛文字冒險遊戲，基本以對話選擇和劇情分歧為主。每個選擇都會影響故事走向及角色之間的關係變化，並導向Good End、Bad End或悲戀結局等多種路線。設有稱為「忍度」的系統，依據主角在任務或抉擇中展現的判斷與行動，忍者等級會有所浮動，而這將左右部分劇情的展開與結局的深度。此外，Switch版本加入觸控操作與界面優化，例如地圖系統讓可以視覺化掌握故事地點變化，歷史記錄新增跳轉功能也提升重玩體驗的便利性。存檔系統改為標籤分類，使玩家在嘗試不同路線時更容易整理劇情進度。

市場評價方面，在女性玩家社群中有著不錯的口碑。角色刻劃真摯細膩，特別是真田十勇士各具魅力且背景豐富，讓每一條支線都有其獨特吸引力。視覺上採用日式戰國幻想風格，角色立繪與場景背景充滿詩意，搭配厚重的配樂與實力派聲優陣容，成功營造出濃郁的戰國氛圍與情感張力。不少玩家認為，雖然本作戀愛成分不像傳統乙女遊戲那樣甜度爆表，但正因其刻劃現實與命運交錯的無奈，使情感更具深度，尤其是走入Bad End或悲戀End時，常令人感到震撼與感傷。

不過也有部分評價指出，在節奏掌握上略顯緩慢，尤其是在前段鋪陳與歷史背景描寫方面，對不熟悉戰國時代的玩家可能會感到門檻較高。此外，戀愛要素的克制風格亦非所有玩家都能接受，若期待的是輕鬆愉快的戀愛喜劇，或許會感覺本作過於沉重。

總結來說，《真紅之焰 真田忍法帳》兼具歷史氛圍與文學氣息，透過戰爭、忠誠與愛情交織出的劇情，展現女性向遊戲少見的厚度與悲壯美感。其深度劇情、細膩角色刻劃與高完成度的移植品質，使其在Nintendo Switch平台上重獲關注，也成為戰國題材乙女遊戲中的代表作之一。

The Crimson Flame: Sanada Ninpocho (Japanese title: 真紅の焔 真田忍法帳) is a romance visual novel developed by the renowned otome game brand Otomate. Originally released for the PlayStation Vita in 2018, it was ported to the Nintendo Switch on February 15, 2024, as one of the inaugural titles under the Otomate Graffiti project. The game is set against the backdrop of Japan’s late Sengoku period, during the historical Siege of Osaka, weaving a tale that seamlessly blends historical events with fictional elements to tell a poignant story of love and destiny that transcends life and death.

The narrative takes place fourteen years after the Battle of Sekigahara, during a time when the country is still unstable under Tokugawa rule. The protagonist, Mutsumi Mochizuki, is a young female ninja who joins the cause of Sanada Nobushige (better known as Yukimura Sanada) in her quest for vengeance following her father’s death in battle. As the story unfolds, players accompany Mutsumi as she integrates into the legendary Sanada Ten Braves, undertaking dangerous missions and making difficult choices amid warfare and political intrigue. Through these trials, she begins to form deep emotional bonds with Yukimura and his ten loyal warriors, each of whom offers a different narrative branch and romantic path, rich in historical context and psychological complexity. Rather than simply sweet romantic moments, the game emphasizes a more restrained and poignant depiction of love grounded in shared convictions and mutual hardship.

From a gameplay perspective, The Crimson Flame: Sanada Ninja Scroll functions as a traditional romance visual novel driven primarily by dialogue choices and branching storylines. Each decision made by the player influences the course of the narrative and the strength of the protagonist’s relationships with other characters, ultimately leading to a variety of endings, including Good, Bad, and Tragic Romance conclusions. A unique “Ninja Level” system tracks Mutsumi’s actions and decisions, adjusting her rank accordingly and impacting the depth and direction of certain story events. The Nintendo Switch version adds touch-screen functionality and an optimized user interface, including a visual map system to track locations, a log with jump features for better navigation through the story, and a categorized save system that helps players manage multiple routes more efficiently.

In terms of reception, the game has received a warm response from the otome gaming community, especially among female players. Critics and fans alike praised the detailed and emotionally resonant character portrayals, particularly the Sanada Ten Braves, each of whom is compellingly written with distinct backgrounds. Visually, the game adopts a poetic take on Sengoku-era Japan, with beautifully illustrated character sprites and scenery that enhance the atmosphere. The immersive soundtrack and high-quality voice performances further elevate the emotional impact, creating a deep and melancholic ambiance befitting the game's historical setting. While the romantic elements are more subdued compared to traditional otome games, this restraint is seen as a strength by many fans, adding a layer of maturity and depth. Particularly during Bad or tragic endings, the emotional weight is often described as both haunting and powerful.

However, some critiques have noted that the game’s pacing can feel slow, especially in its early chapters, where historical exposition and worldbuilding take center stage. Players unfamiliar with the Sengoku period may find the setting slightly inaccessible without prior knowledge. Additionally, the emotionally heavy and serious tone of the story may not appeal to those seeking a lighthearted romantic comedy experience.

In summary, The Crimson Flame: Sanada Ninja Scroll is a compelling blend of historical gravitas and literary storytelling, offering a rare depth and tragic beauty within the otome genre. With its richly layered narrative, nuanced character development, and well-executed Switch port, the game has garnered renewed attention and stands out as a notable title among war-themed romance visual novels.