Nihonbashi Immersive Mystery Tour 'The Flame of Vow' Launched by Mitsui Fudosan and DeNA Using AR App 'Arplat' and Collaborating with Keigo Higashino's Series
Mitsui Fudosan and DeNA will hold an AR-based experiential mystery event 'The Flame of Vow' in Nihonbashi, Tokyo, from April 2026. The event features a collaboration with Keigo Higashino's popular 'Kaga Kyoichiro' series, blending real city exploration with digital storytelling via the 'Arplat' app.
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- 📰 Published: April 27, 2026 at 22:17
- 🔍 Collected: April 27, 2026 at 14:01
- 🤖 AI Analyzed: April 28, 2026 at 01:57 (11h 55m after Collected)
Mitsui Fudosan Co., Ltd. and DeNA Co., Ltd. will host an experiential mystery event titled 'Nihonbashi Experiential Mystery: The Flame of Vow' in the Nihonbashi area of Tokyo from April 27, 2026, to March 30, 2027. The event utilizes 'Arplat,' an AR (Augmented Reality) app developed by DeNA.
About Arplat:
'Arplat' is an experiential mobile app developed and operated by DeNA that fuses location-based information with AR technology. Through actual city walking, it provides a new entertainment experience where the real world and digital narratives intersect. Based on the concept of regional revitalization and rediscovering city charm, it offers diverse content, such as mystery-solving tours with original stories, on a single platform.
Background of the Project:
In Nihonbashi, its place of origin, Mitsui Fudosan has been working with the public and private sectors to create new vibrancy by combining urban development and entertainment. This time, in collaboration with DeNA, they developed an event within the 'Arplat' app that allows visitors to enjoy a narrative experience while touring the streets of Nihonbashi. By utilizing historical streetscapes, shops, and landmarks as settings where walking itself becomes an 'experience,' the project aims to promote exploration and improve the value of visitors' stays.
DeNA, building on its expertise in the internet field, operates businesses in entertainment sectors such as games, anime, and IP content, as well as in urban development sectors like sports and smart cities. Through this multifaceted operation, DeNA has cultivated expertise in developing unique revenue models and solutions using digital technology.
This project leverages the strengths and assets of both Mitsui Fudosan and DeNA to revitalize the Nihonbashi area and help visitors rediscover its charm through an approach of 'Urban Development x Entertainment.'
Street Walking x Mystery Solving via AR App:
The event will be held as a limited-time program within the 'Arplat' app. Participants will solve a mystery set in Nihonbashi while walking through the city. By visiting specific spots such as famous landmarks to obtain scenarios, players progress through the story and conduct their investigations. AR and location-based technology link the world of the narrative with real streetscapes, providing an immersive experience.
Collaboration with Keigo Higashino's 'Kaga Kyoichiro Series':
The event features an original fictional story for Arplat, allowing participants to experience the charm of Nihonbashi while solving mysteries. Additionally, through a collaboration with the 'Kaga Kyoichiro Series' (by Keigo Higashino), which includes works like 'The Newcomer,' 'Wings of the Kirin,' and 'The Death of a Legend' (all set in Nihonbashi), the character 'Kaga Kyoichiro' will appear in the app's original story.
Introduction:
A relative's body is found in Nihonbashi. Is it a crime or an accident? Left in hand is a single photograph of unknown people and small numbers. The protagonist visits Nihonbashi to uncover the truth. There, an encounter with detective Kaga Kyoichiro awaits, along with the complex relationships surrounding the uncle. A 'drowned body' found on land—why did he die there?
Event Overview:
Title: Nihonbashi Experiential Mystery -The Flame of Vow-
Period: April 27, 2026 (Mon) to March 30, 2027 (Tue)
Location: Nihonbashi Muromachi Area, Chuo-ku, Tokyo
Content: Experiential mystery solving using the AR app 'Arplat'.
Estimated time to complete: 3 to 5 hours.
Special Site: https://lp.arplat.jp/chikai/
About Arplat:
'Arplat' is an experiential mobile app developed and operated by DeNA that fuses location-based information with AR technology. Through actual city walking, it provides a new entertainment experience where the real world and digital narratives intersect. Based on the concept of regional revitalization and rediscovering city charm, it offers diverse content, such as mystery-solving tours with original stories, on a single platform.
Background of the Project:
In Nihonbashi, its place of origin, Mitsui Fudosan has been working with the public and private sectors to create new vibrancy by combining urban development and entertainment. This time, in collaboration with DeNA, they developed an event within the 'Arplat' app that allows visitors to enjoy a narrative experience while touring the streets of Nihonbashi. By utilizing historical streetscapes, shops, and landmarks as settings where walking itself becomes an 'experience,' the project aims to promote exploration and improve the value of visitors' stays.
DeNA, building on its expertise in the internet field, operates businesses in entertainment sectors such as games, anime, and IP content, as well as in urban development sectors like sports and smart cities. Through this multifaceted operation, DeNA has cultivated expertise in developing unique revenue models and solutions using digital technology.
This project leverages the strengths and assets of both Mitsui Fudosan and DeNA to revitalize the Nihonbashi area and help visitors rediscover its charm through an approach of 'Urban Development x Entertainment.'
Street Walking x Mystery Solving via AR App:
The event will be held as a limited-time program within the 'Arplat' app. Participants will solve a mystery set in Nihonbashi while walking through the city. By visiting specific spots such as famous landmarks to obtain scenarios, players progress through the story and conduct their investigations. AR and location-based technology link the world of the narrative with real streetscapes, providing an immersive experience.
Collaboration with Keigo Higashino's 'Kaga Kyoichiro Series':
The event features an original fictional story for Arplat, allowing participants to experience the charm of Nihonbashi while solving mysteries. Additionally, through a collaboration with the 'Kaga Kyoichiro Series' (by Keigo Higashino), which includes works like 'The Newcomer,' 'Wings of the Kirin,' and 'The Death of a Legend' (all set in Nihonbashi), the character 'Kaga Kyoichiro' will appear in the app's original story.
Introduction:
A relative's body is found in Nihonbashi. Is it a crime or an accident? Left in hand is a single photograph of unknown people and small numbers. The protagonist visits Nihonbashi to uncover the truth. There, an encounter with detective Kaga Kyoichiro awaits, along with the complex relationships surrounding the uncle. A 'drowned body' found on land—why did he die there?
Event Overview:
Title: Nihonbashi Experiential Mystery -The Flame of Vow-
Period: April 27, 2026 (Mon) to March 30, 2027 (Tue)
Location: Nihonbashi Muromachi Area, Chuo-ku, Tokyo
Content: Experiential mystery solving using the AR app 'Arplat'.
Estimated time to complete: 3 to 5 hours.
Special Site: https://lp.arplat.jp/chikai/