未然探偵 The Protea Cases: Solve Crimes with an AI Prediction App

6/4/2026, 4:43:31 PM

Tags: #adventure #visual-novel #choose-your-own-adventure #2d #mystery #female-protagonist #singleplayer

User Reviews

Score: 100%9 user reviews
Review Count: 9 reviews
Fetched At: 6/4/2026, 4:43:32 PM

Live Store Snapshot

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Japan Price: ¥ 1,300
Global Price: $12.99
Sale Status: Regular pricing
Price Checked At: 6/4/2026, 4:43:31 PM

Key highlight

In "未然探偵 The Protea Cases," solve mysteries in 2023 Shinjuku using a crime prediction AI. Navigate branching storylines and forge bonds with allies as you prevent crimes, with choices leading to multiple endings.

Who this is for

For fans of narrative-driven mystery games, "未然探偵 The Protea Cases" offers a compelling experience. The unique premise of using a crime prediction AI to solve cases, combined with branching storylines and multiple endings, makes for an engaging adventure.

Details

Step into the shoes of Itsuki Chiharu, a young woman struggling with self-doubt following a past trauma. Her life takes an unexpected turn when, while searching for a missing person, she stumbles upon 'Protea,' a mysterious app developed by the Metropolitan Police Department and currently in experimental use in Shinjuku.

This isn't just any app; it's a cutting-edge crime prediction AI.

Guided by Protea's forecasts, Chiharu finds herself drawn into a series of intriguing cases. Along the way, she encounters a detective seeking her cooperation and a mysterious boy who seems to appear at crime scenes with uncanny regularity.

Together, they embark on a mission to prevent crimes before they happen, forging bonds as they navigate the dangerous streets of 2023 Shinjuku.

The core gameplay revolves around intuitive controls that allow players to gather information, make accurate predictions, and engage in deductive reasoning to thwart crimes. From petty theft to more sinister acts like murder, the city is rife with incidents.

Chiharu must collaborate with her detective colleagues and the head of her detective agency to confront these escalating threats. The narrative branches out, offering multiple endings based on the player's choices, ensuring a unique experience with each playthrough.

Overview

"未然探偵 The Protea Cases" is the third installment in a romantic mystery series from developer orange, following "Gothic Murder" and "Girl Commander's Reasoning Area - The Secret of Golden Island -". This adventure game places players in the role of Itsuki Chiharu, who gains access to a crime prediction AI named Protea.

Set in Shinjuku in 2023, the story follows Chiharu as she uses Protea's predictions to investigate and prevent various crimes, encountering allies and a mysterious boy along the way. The game features intuitive controls for gathering information and making deductions, with choices leading to multiple branching endings.

Highlights

Developed by orange, known for their work on mystery ADV titles, with scenario by Mitsue Kaneko and illustrations by Misa Ren.
Features a compelling narrative set in 2023 Shinjuku, where players utilize a crime prediction AI to solve cases.
Offers multiple branching endings determined by player choices, providing replayability.

Who It's For

Fans of mystery adventures, visual novels, and choose-your-own-adventure games will find "未然探偵 The Protea Cases" particularly engaging. Players who enjoy narrative-driven experiences with a focus on deduction and character interaction will appreciate this title.