• 2026-02-16 V3.0.0 Migrated to Astro SSG — all pages now statically generated for improved SEO and page load speed
• 2026-02-16 Changed URL structure to /ja/, /en/ path prefixes (old URLs auto-redirect)
• 2026-02-16 Sitemap now auto-generated with hreflang support
• 2026-02-15 V2.3.0 Added new service "Strategic ROI Intelligence" (AI-powered PEST, SWOT & 3C analysis tool)
• 2026-02-14 V2.2.0 Added SNS links (X, LinkedIn, Instagram, Product Hunt) to footer
• 2026-02-14 Added English/Japanese switching for meta title and description
• 2026-02-14 Fixed Twitter OGP not displaying
• 2026-02-14 Added environment variable validation to deploy.sh
• 2026-02-14 Separated .env files into local and production
• 2026-02-12 V2.1.0 Added related links to footer
• 2026-02-12 Created release notes page
• 2026-02-12 Added feedback feature to article pages (with Slack notification)
• 2026-02-12 Added Google ad between 1st and 2nd items in Case Files and Classified Files lists
• 2026-02-12 Created privacy policy page
• 2026-02-02 V2.0.0 ROI Detective Agency renewal
• 2026-01-23 V1.7.1 Added navigation cards for learning content and services
• 2025-12-23 V1.7.0 Added article links to Classified Files
• 2025-12-21 V1.6.7 Added business framework "ECRS" to Classified Files
• 2025-12-20 V1.6.6 Added business frameworks "CAGE" and "STP" to Classified Files
• 2025-12-15 V1.6.5 Added business framework "RICE" to Classified Files
• 2025-12-12 V1.6.4 Added business framework "RFP" to Classified Files
• 2025-11-07 V1.6.3 Added Gemini analysis report to Reports page
• 2025-11-06 V1.6.2 Published 300 Case File articles
• 2025-11-04 V1.6.1 Added business framework "Persona Analysis" to Classified Files
• 2025-10-27 V1.6.0 Added business framework "ICE Scoring" to Classified Files
• 2025-10-24 V1.5.9 Added related files to Case File articles
• 2025-10-20 V1.5.8 Added business framework "Kano Model" to Classified Files
• 2025-10-20 V1.5.7 Added business framework "BOM" to Classified Files
• 2025-10-20 V1.5.6 Added business framework "NPS" to Classified Files
• 2025-10-07 V1.5.5 Added social share buttons "LinkedIn" and "Facebook" to Classified Files and Case Files
• 2025-10-06 V1.5.4 Added business framework "HEART" to Classified Files
• 2025-10-02 V1.5.3 Added business framework "Agile Development" to Classified Files
• 2025-09-30 V1.5.2 Added business frameworks "MVP" and "Implementation First Principle" to Classified Files
• 2025-09-25 V1.5.1 Added 6D Matrix business framework to Classified Files
• 2025-09-22 V1.5.0 Added Blue Ocean Strategy business framework to Classified Files
• 2025-09-17 Translation rewrite up to Episode 200
• 2025-09-17 Published 200 Case File articles
• 2025-09-16 V1.4.9 Added Scene Cast Theory business framework to Classified Files
• 2025-09-11 V1.4.8 Added Double Diamond and Design Thinking business frameworks to Classified Files
• 2025-09-10 V1.4.7 Added Jobs-to-be-Done Theory and OKR business frameworks to Classified Files
• 2025-09-08 V1.4.6 Added RCD business framework to Classified Files
• 2025-09-05 V1.4.5 Added OODA business framework to Classified Files
• 2025-09-02 V1.4.4 Split Case Files and Classified Files rankings on Ranking page
• 2025-08-22 V1.4.3 Added 8 data analysis books by ROI Detective to Ranking page
• 2025-08-02 V1.4.2 Added ads and trends for Indian and Japanese audiences to Reports page
• 2025-07-29 Produced up to Episode 100 of Case Files
• 2025-07-29 Translation rewrite up to Episode 100
• 2025-07-28 V1.4.1 Added device-type charts to Reports page
• 2025-07-27 V1.4.0 Added Ranking page to menu tabs
• 2025-07-26 V1.3.4 Added repeat user charts to Reports page
• 2025-07-26 V1.3.3 Added per-user and per-pageview AdSense revenue charts to Reports page
• 2025-07-20 V1.3.2 Added breadcrumb navigation to header
• 2025-07-19 V1.3.1 Added like button to Case Files and Classified Files
• 2025-07-18 V1.3.0 Optimized mobile browsing UX
• 2025-07-13 V1.2.0 Added screen views to Case Files and Classified Files
• 2025-07-11 V1.1.0 Added visitor count to Data Analysis LP
• 2025-07-11 V1.0.0 Added system version to footer
• 2025-07-08 Launched Data Analysis LP
• 2025-07-05 Added moving average to Reports page charts
• 2025-07-04 Added daily top 3 ranking to Classified Files
• 2025-06-29 Added Reports page to header navigation
• 2025-06-29 Added reading time to article pages
• 2025-06-27 Added Google AdSense revenue chart
• 2025-06-26 Added business frameworks X014–X026 to Classified Files
• 2025-06-22 Added latest news to top of article pages
• 2025-06-22 Published English edition of "The Irresponsibility Conspiracy" on Kindle
• 2025-06-21 Published Japanese edition of "The Irresponsibility Conspiracy" on Kindle
• 2025-06-16 Added trendlines to active user and pageview charts
• 2025-06-16 50 Markdown articles published
• 2025-06-16 Translation rewrite up to Episode 50
• 2025-06-15 Added active user chart to Roadmap page
• 2025-06-15 Added pageview chart to Roadmap page
• 2025-06-14 Automated weekly ranking display using GA4 view counts
• 2025-06-14 Added New icon for articles posted within 24 hours
• 2025-06-13 Added pagination to Case Files
• 2025-06-13 Added thumbnail images to Case Files
• 2025-06-09 Translation rewrite up to Episode 30
• 2025-06-09 Translation rewrite up to Episode 10
• 2025-06-08 Created top page
• 2025-06-07 Added SNS icon buttons to footer
• 2025-06-07 Launched Classified Files
• 2025-06-07 Published Privacy Policy
• 2025-06-07 Published Sitemap
• 2025-06-07 Published Roadmap
• 2025-06-03 Published Member Profiles
• 2025-06-02 Launched English site pages
• 2025-06-02 Added English/Japanese toggle button
• 2025-06-02 Published first English page
• 2025-06-02 Added global language support
• 2025-06-01 Set up Google AdSense
• 2025-05-30 Applied for Google AdSense
• 2025-05-30 Enhanced profiles and detective imagery
• 2025-05-30 Set up Slack notification for contact form submissions
• 2025-05-27 30 Markdown articles published
• 2025-05-24 Added tag filtering feature
• 2025-05-12 Added contact form (CTA enhancement)
• 2025-05-07 10 Markdown articles published
• 2025-05-04 Added internal links (previous/next article)
• 2025-05-04 Added sitemap.html
• 2025-05-03 Added description tags, updated sitemap.xml
• 2025-05-01 Developed ROI quick simulator
• 2025-04-30 5 Markdown articles published
• 2025-04-30 Event tracking via Google Tag Manager (GTM)
• 2025-04-28 Introduced Google Analytics 4 (GA4)
• 2025-04-27 Added SNS (X) share button to articles
• 2025-04-26 Published roadmap
• 2025-04-26 Added back-to-top button
• 2025-04-25 Enhanced SEO with title, tag, and OGP optimization
• 2025-04-25 Stabilized SEO with automatic sitemap.xml updates
• 2025-04-25 OGP and SEO support
• 2025-04-25 Automatic sitemap.xml generation
• 2025-04-25 OGP card display successful (SNS integration ready)
• 2025-04-25 Created X (formerly Twitter) account
• 2025-04-24 Responsive design implementation
• 2025-04-24 Site launch and deployment
• 2025-04-23 Built Markdown article viewer