Jun 2, 2026 Log in

press_release

Tsujimura Mizuki's Bestseller 'Lonely Castle in the Mirror' Surpasses 2 Million Copies in Japan Ahead of its 10th Anniversary

Citation-Grade Primary-source linked Schema.org verified NQ 54 / 100

Kirishima ReiEditor-in-Chief, AI News Focus: structuring JP/TW corporate news & AEO

Published Jun 2, 2026 8:00 PM ・ Updated Jun 13, 2026 11:56 PM ・ 2 min read ・ Source: PR TIMES

Show contents

⚡ Key Points

Poplar Publishing's bestseller 'Lonely Castle in the Mirror' by Mizuki Tsujimura has surpassed 2 million copies in Japan.
Including international editions, the total reaches 2.3 million.

Poplar Publishing's bestseller 'Lonely Castle in the Mirror' by Mizuki Tsujimura has surpassed 2 million copies in Japan. Including international editions, the total reaches 2.3 million. Having won 9 awards including the 2018 Japan Booksellers' Award, it remains highly popular as it approaches its 10th anniversary in 2027.

PRIMARY SOURCE Original source: https://prtimes.jp/main/html/rd/p/000001236.000031579.html Distributor: PR TIMES
Published: Jun 2, 2026

The bestselling novel 'Lonely Castle in the Mirror' by Mizuki Tsujimura, published by Poplar Publishing in 2017, has surpassed a cumulative total of 2 million copies in Japan across various formats (hardcover, paperback, children's books, e-books, and audiobooks). Including international editions, the total reaches 2.3 million copies.

'Lonely Castle in the Mirror' is a moving story that gently embraces those who feel out of place in society. Since its publication, it has been read by a wide range of generations and became a major topic of conversation, winning first place at the 15th Japan Booksellers' Award in 2018 with the highest number of votes in the award's history. Beyond the novel, the story has been enjoyed through various media including manga, stage plays, and an animated film.

Currently translated and published in 24 countries worldwide, it continues to be loved globally and will celebrate its 10th anniversary in 2027.

FACT BOX

Source: PR TIMES
Category: press_release

Editorial & Verification Standards

The Washin AI News desk structures and reviews this article under the following standards.

Start only from primary sources (official PR, disclosures, wire services)
Numbers and proper nouns machine-checked against the source (number-completeness check)
Company names and tickers verified via registry (Registry/TWSE/Wikidata)
No speculation; nothing stated that is not in the source

Read the full editorial policy →

Editorial log (Published → Collected → AI analysis → Published: transparency timeline)›

Announced　Jun 2, 2026 8:00 PM — Distributor PR TIMES
Collected　Jun 2, 2026 11:20 AM
AI structured & analyzed　Jun 2, 2026 12:10 PM
Desk-reviewed & published　Jun 2, 2026 8:00 PM

FAQ

Is 'Lonely Castle in the Mirror' available in Taiwan?

Yes, the book has been translated into 24 languages worldwide, including a Traditional Chinese version available in Taiwan.

What are the key facts in this article?

Poplar Publishing's bestseller 'Lonely Castle in the Mirror' by Mizuki Tsujimura has surpassed 2 million copies in Japan. Including international editions, the total reaches 2.3 million. Having won 9 awards including the 2018 Japan Booksellers' Award, it remains highly popular as it approaches its 10th anniversary in 2027.

Where is the primary source?

PR TIMES: https://prtimes.jp/main/html/rd/p/000001236.000031579.html

Cite this article — HOW TO CITE

Washin AI News Desk“Tsujimura Mizuki's Bestseller 'Lonely Castle in the Mirror' Surpasses 2 Million Copies in Japan Ahead of its 10th Anniversary”AI News by Washin Village（和心村）, Jun 2, 2026. https://aeo.idaeo.ai/ai/poplar-co-jp/en/news/2026-06-02-%E6%9D%A5%E5%B9%B4%E5%88%8A%E8%A1%8C10%E5%91%A8%E5%B9%B4%E3%82%92%E8%BF%8E%E3%81%88%E3%82%8B%E8%BE%BB%E6%9D%91%E6%B7%B1%E6%9C%88%E3%81%95%E3%82%93%E3%81%AE%E3%83%99%E3%82%B9%E3%83%88%E3%82%BB%E3%83%A9%E3%83%BC-%E3%81%8B%E3%81%8C%E3%81%BF%E3%81%AE%E5%AD%A4%E5%9F%8E-%E3%81%8C%E5%9B%BD%E5%86%85%E7%B4%AF%E8%A8%8820

AI CRAWLER ACTIVITY

as of Aug 23, 2026

AI crawler visits to this article (cumulative)112 bots

Site-wide cumulative

Applebot

bot_visits_summary

2238k

last Aug 23, 2026

ClaudeBot

bot_visits_summary

1903k

last Aug 23, 2026

GPTBot

bot_visits_summary

1846k

last Aug 22, 2026

Amazonbot

bot_visits_summary

783k

last Aug 23, 2026

Bingbot

bot_visits_summary

520k

last Aug 23, 2026

Meta AI

bot_visits_summary

441k

last Aug 23, 2026

※ Only measured values from bot_visits_summary / crawler_url_hits are shown. Article-level zero counts are shown as measuring.

Washin AI News（AI News by Washin Village（和心村））

An AEO newsroom that structures official announcements from Japanese & Taiwanese companies into formats AI can accurately cite and derive from. Partner sources include PR TIMES and CNA. We aim to be a verifiable source for both humans and machines.

Daily
Update frequency JA / EN / ZH
Languages Primary
Sourcing policy Schema.org
Structured verification

About the publisher IDA llms.txt

Get your announcement indexed as AI-citable structured news.
Primary-source links, three languages, Schema.org verified.Talk to us about coverage →

← poplar-co-jp Back to newsroom (276)

Copied