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HOME > No.20, Feb 2020 > Oni-doko: Enjoy the Traditional Toyohashi Oni Matsuri (Ogre Festival) with your Smartphone and Cutting-edge IT

Oni-doko: Enjoy the Traditional Toyohashi Oni Matsuri (Ogre Festival) with your Smartphone and Cutting-edge IT

By Ren Ohmura and Akihiro Mizutani
Ren Ohmura and Akihiro Mizutani

Since 2018, Dr. Ren Ohmura (Associate Professor at Toyohashi University of Technology’s Department of Computer Science and Engineering) and Dr. Akihiro Mizutani (Associate Professor at the Department of Architecture and Civil Engineering) have been working with undergraduate students, graduate students, and local companies to provide a new way to enjoy the Oni Matsuri (Ogre Festival). While the festival itself dates back over 1,000 years, the project uses the latest technology combined with smartphones.

Fig.1

The Toyohashi Oni Matsuri, a designated national Important Intangible Folk Cultural Property, is a festival held every February to promote a good harvest and ward off evil. Particularly notable is a performance known as "Aka-oni to Tengu no Karakai" (Rivalry Between the Red Ogre and Long-nosed Goblin), where the shrine premises play host to a battle between the Tengu, a deity of war, and the mischievous Aka-oni, with the Tengu emerging victorious. Afterward, the Aka-oni and his accomplices make an apology and walk through the holy areas of town while dispersing white powder and traditional sweets known as tankiri-ame.

Fig.2

Bathing in the white powder thrown by the Aka-oni and eating the tankiri-ame sweets is said to ensure a healthy summer free of illness. The Tengu also makes a separate trip through the holy areas of town. Their long journeys continue from the evening late into the middle of the night, and no one knows when and where they will appear. Until now, the only way to enjoy the Toyohashi Oni Matsuri was by viewing it in person or watching partial broadcasts on local cable television.

To allow more people to enjoy the festival, the Oni-doko web app was developed. The Aka-oni, Tengu, and their accomplices carry a GPS device, and the app shows their location on a map in real-time. The app lets users see where the Aka-oni and Tengu are via their smartphone, allowing them to follow along or predict when the Aka-oni or Tengu will reach their area. This eliminates the need for long waits in the cold night, allowing small children and seniors to more easily see the Aka-oni and Tengu and safely participate in the festival.

Fig.3

The app also lets people outside of Toyohashi enjoy a simulation of the festival. Those living overseas and past residents of Toyohashi who have nostalgic memories of the festival can now participate in real-time in what is called the world’s strangest festival. On top of that, many organizers used the app when making preparations at the shrine and other venues on the day of the festival, helping ensure smooth festival operations. In February of 2019, approximately 4,800 people downloaded the Oni-doko app to enjoy the Toyohashi Oni Matsuri.

Fig.4

A crowdfunding campaign to fund the app’s development was launched in 2019. The goal of this campaign is to have many festival-goers provide a small amount of support each to enable the continued development of the app. As a thank-you gift, supporters are provided with beautiful merchandise affiliated with the festival and the Akumi Kanbe Shinmeisha Shrine. In 2020, additional gifts designed by students were added, such as traditional goshuin-cho booklets, goshuin-cho booklet cases, and ema plaques.

The Oni-doko app offers a fun new way to enjoy a festival rich in tradition, with the hope that anyone can now take part in the Toyohashi Oni Matsuri safely and with peace of mind.

鬼どこ: 国指定重要無形民俗文化財「豊橋鬼祭」をスマホと最新IT技術で楽しむ


By 大村 廉 and 水谷 晃啓

豊橋技術科学大学情報・知能工学系准教授大村廉と建築・都市システム学系准教授水谷晃啓は、学生・大学院と地域の企業とも協力して、1000年以上の歴史を持つ「豊橋鬼祭」を楽しむ新しい方法を2018年から提供しています。

「豊橋鬼祭」は豊年と厄除けの祭りとして2月に毎年行われる神事で、国の重要無形民俗文化財に指定されています。特に「赤鬼と天狗のからかい」では、武神天狗と悪戯をする赤鬼が戦い、天狗が勝利を収めます。その後、赤鬼はお付きの者と共にお詫びとして白い粉とタンキリ飴をまき散らしながら町中を巡ります。その粉を浴び、タンキリ餅を食べると病気にならず健康に過ごせるとされます。また、天狗も鬼とは別に町を巡回します。この巡回は夕方から真夜中まで続く長いものですが、鬼や天狗がどこを回るのか、いつどこに現れるのかは誰にも分かりません。また、鬼祭を楽しむには祭りが行われる豊橋市にある安久美神戸神明社の氏子町まで来ないといけませんでした。

そこで、赤鬼や天狗と一緒に移動するお付きの者にGPSを持って貰い、スマホからリアルタイムで赤鬼と天狗の場所を地図上に示すシステム「鬼どこ」を開発しました。このシステムを使うことで、鬼と天狗がどこに居るかがわかり、追いかけたり、自分のところに来る時間を推定することも可能です。それによって、小さな子どもや老人も安心して鬼や天狗を待つことができ、また安全に祭りに参加できます。そして、豊橋から遠く離れた人もスマホで鬼祭を疑似体験することができます。昔豊橋に住んでいた人がお祭りを体験して懐かしく思ったり、海外に住む人が天下の鬼祭と呼ばれる鬼祭をリアルタイムに体験することも可能です。2019年2月のお祭りでは約4800人が鬼どこをダウンロードして鬼祭を楽しみました。

2019年からは、クラウドファンディングにより鬼どこシステムの開発費用を募集しています。これは、祭りを楽しむ多くの人が少しずつ支えることによって鬼どこの開発を永続的にするという目的があります。また、そのお礼として、鬼祭や安久美神戸神明社に関わる素敵な物を用意しています。2020年は、学生がデザインした御朱印帳、御朱印帳入れ、絵馬もお礼に追加されました。

鬼どこシステムを通じて、歴史あるお祭りに新しい楽しみ方を提供し、誰もが安心安全に鬼祭りを楽しめることを期待しています。

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Researcher Profile

Ren Omura
Name Ren Omura
Affiliation Department of Computer Science and Engineering
Title Associate Professor
Fields of Research Ubiquitous Computing/Wearable Computing/Distributed System/Operating System

Researcher Profile

Akihiro Mizutani
Name Akihiro Mizutani
Affiliation Department of Architecture and Civil Engineering
Title Associate Professor
Fields of Research Architectural Design / Architectural Planning/ Urban Design

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