#Japan #Tokyo #Tokyo Subway #Mystery Event #Keio Line

Railway Detective and the Two Departure Bells: An Exciting Puzzle Solving Adventure for Adults

Prepare yourself for a thrilling mystery-solving event titled 'Railway Detective and the Two Departure Bells', brought to you by Keio Electric Railway Co., Ltd. and the Tokyo Metropolitan Bureau of Transportation. This engaging event will run from December 19, 2025 until March 15, 2026, and invites adults to embark on an intriguing journey around the Keio Line, Inokashira Line, and Tokyo subway system.

Starting at any station along the route and utilizing a special pamphlet distributed at stations, participants will unravel the mystery by gathering clues and solving puzzles. This experience-driven event highlights the collaboration between Keio Electric Railway and the Tokyo Bureau of Transportation, aiming to attract passengers across their interconnected services.

Key Features

1. Joint Operation: The event emphasizes mutual passenger attraction between Keio and the Tokyo Subway, taking advantage of their direct transit services.
2. Economical Travel: For just 1,000 yen (adults), travelers can purchase a one-day pass for unlimited rides on the Keio Line and Inokashira Line, while a 700 yen pass gives access to the Tokyo subway. These tickets ensure that participants can immerse themselves fully in the adventure without worrying about costs.
3. Eye-catching Branding: Throughout the event, trains on both the Keio Line and Inokashira Line will feature original headmarks, while a special sticker will adorn the side of the leading car on the Tokyo Shinjuku Line.

Event Overview

The 'Railway Detective Series' immerses players in a narrative where they assume the roles of a 'Railway Detective K' and their assistant (the participant). With two distinct routes available—Keio Edition and Tokyo Subway Edition—participants can start their adventure from either line and work their way through a series of engaging puzzles.

Upon completing both routes, adventurous souls can take on the Extra Edition, unlocking the potential for substantial prizes based on their performance throughout the various courses.

Event Schedule

The event spans from December 19, 2025, to March 15, 2026, excluding a few specific dates:

• - Keio Edition: No services on January 1 and February 17, 2026.
• - Recommended participation should occur during daylight hours.

Pamphlet Distribution

Pamphlets containing puzzles will be distributed at key stations along both the Keio and Inokashira lines, as well as numerous subway stations (excluding certain select ones).

• - Total distribution comprises 80,000 pamphlets (40,000 from Keio and 40,000 from the Tokyo Bureau).
• - Supplies will be limited and will conclude once all pamphlets are handed out.

Participation Steps

• - Choose between the Keio Edition and Tokyo Subway Edition.
• - Each edition requires an estimated 4 to 5 hours for completion. Once you navigate through both editions, feel free to attempt the Extra Edition.
• - Answers can be submitted through a smartphone-optimized web platform where players can input their responses using unique QR codes found in the pamphlets. Successful completion yields 'clear keywords' that signify your progress.
• - By accessing the event's dedicated web page and submitting details alongside your clear keywords, participants can enter a raffle for exciting prizes, with additional entries available for those who complete both edition routes.
• - The event page can be found here: Event Page.
• - A smartphone with internet access is required for participation.

Prizes

Prizes will include various selections, with detailed information available via the event page. The final date for prize entries is March 15, 2026 at 23:59. Winners will be announced upon prize shipments.

Customer Service Contacts

For any inquiries, please reach out to the following centers:

• - Keio Customer Center: 03-3325-6644 (9:00–18:00) - Closed from December 30, 2025, to January 3, 2026.
• - Tokyo Subway Customer Center: 03-3816-5700 (9:00–20:00, open year-round).

This immersive detective-themed event is a fantastic way for adults to engage with public transport while enjoying an exciting puzzle-solving journey. Don't miss this unique opportunity to explore, solve mysteries, and potentially win great prizes while navigating Tokyo's intricate rail network.