Oshiro
Woodblock-style picture of a Japanese castle on high stone walls above a moat at sunrise, with mountains in the mist and cherry blossoms

日本100名城 · 続日本100名城

Oshiro お城

Japan's 200 famous castles, a stamp book you fill by going there.

Step into the castle grounds, look for clues the way a curious visitor explores, and earn up to three stars at every castle.

Oshiro for AndroidGet it on Google PlaySee how it works

一城一頁 · One castle, one page

Three stars for every castle

The book covers 200 castles: the 100 Fine Castles of Japan (日本100名城) and the 100 that followed (続日本100名城). Each castle is a page, and each page has three seals to earn.

  1. Visited

    Check in when you step inside the castle area (GPS).

  2. Captured

    Find enough of the castle's clues.

  3. Conquered

    Find every clue, special ones included.

The Ueda Castle page in Oshiro: a photo of the castle gate, the castle's name and the three seals Visited, Captured and Conquered with a Check in button
The Visited seal 登城 stamped in vermilion after checking in at Ueda Castle

攻城 · Clues on site

Clues you can only find by being there

More than 60 castles have hand-made sieges. Dozens of other castles have simple missions generated from map data, and every castle can be visited.

  • Hidden GPS points

    At gates, turrets and wells: reach the spot to find the clue.

  • Photo clues

    Take the picture with the in-app camera; it stays on your phone as a keepsake.

  • AR banners

    Items that appear when you turn your camera toward them.

  • Signboard quiz

    At some castles, a question about the signboard in front of you.

The clue list of Ueda Castle: a quiz already found, more quizzes, an AR item and a photo clue, each with its distance
A signboard quiz at Ueda Castle with four answers and a hint for where to look

ゆかりの地 · Character cards

Meet the people behind the castles

The Sanada, Takeda, Oda, Toyotomi, Tokugawa, Uesugi and Date families and those around them. Visit places linked to each life (castles, temples, graves, battlefields) and the card grows from bronze to silver to gold, unlocking a biography and sourced stories.

  1. Bronze
  2. Silver
  3. Gold

旅路 · Story routes

Seven journeys, from the Sanada to the Date, each with a short chapter at every stop.

Character cards of the Sanada clan in the stamp book, with historical portraits and their bronze tier
The Sanada Road story route: a map of its stops and the first chapter at Iwabitsu Castle

スタンプ帳 · Your stamp book

A book that fills as you travel

  • 登城印 visit seals

    A keepsake seal for every castle you visit, to keep or share.

  • Footprint map

    Colour in Japan's 47 prefectures and the old provinces as you travel.

  • Your banner (旗印)

    Choose a family crest and a colour.

登城印 are Oshiro keepsakes, not official 御城印.

The 登城印 visit seal of Ueda Castle, written vertically with the date and the Sanada crest, and a Share button

城めぐり · Plan your visit

All 200 castles, and the ones near you

A map and list of all 200 castles and the castles near you. Castles with a full page add their history, opening hours, fees, where to find the 100名城 stamp and where the 御城印 is sold.

Opening hours and rules change: check the official information before you go, and follow the rules on site.

The map of Japan in Oshiro with groups of castles from Hokkaido to Kyushu

静 · Respectful by design

Quiet where it should be

At shrines, temples and graves there are no quizzes, photos or AR items, and the app stays silent.

Three languages, no account

Your journey stays yours

Read the privacy policy

Your stamp book is waiting

Two hundred castles, one page each.

Oshiro for AndroidGet it on Google Play