Kids EdTech SaaS · Queue #8 · GDD v3.0
Book Fairy Tales
椿町 Tsubaki-chō · $9.99/mo or $79/yr · bookfairytales.com
A subscription SaaS for ages 5–12: Godot 4 web client embedded at bookfairytales.com/play, Laravel backend with Stripe billing, Claude-powered NPC lessons, and a COPPA-conscious parent dashboard. Tangential learning — kids play arcade cabinets and explore districts; curriculum follows desire, not worksheets.
Play · Explore · Discover · Grow
Parent-first accounts · 3 child profiles
Core loop
City kids actually want
Tsubaki-chō Central Station hub → ride train to a district → walk top-down pixel streets → approach NPC → Claude generates fresh activity (story, quiz, puzzle) → earn stars and cosmetics → parent dashboard logs every session.
15–30 minute sessions, 3–5 activities. Jūkū Games arcade cabinets need no educational framing — new seasonal drops are push-notification retention events.
Systems
SaaS product stack
/parent dashboard: session history, AI content log, grade override, district unlocks, weekly email reports. /api/v1/content proxies Claude (key never in client); Redis caches per NPC per session.
Common Core, French CNED, MEXT curriculum tracks. Homeschool and expat families are secondary high-value segments. Cosmetics earned only — no IAP cosmetics.
World · scope
Tsubaki-chō districts
Phase 1 — Shrine Quarter
Kitsune keeper, tanuki riddles, zen garden mindfulness, onsen culture NPCs. Shinto animism through story.
Phase 2 — Festival + City Streets
ゲームセンター with Alb_pixel arcade rows; ゲームショップ Pozac release posters. Math embedded in stall economics.
Phase 3 — Yōkai Quarter
Ages 10–12, parent-dashboard unlock. Respectful kaidan atmosphere — spooky, not horror.
Portal roadmap
Sealed torii gates glow at district edges — Fairy Tale Kingdom, Le Petit Quartier, Vectoraith worlds. $0 additional asset spend.
Scope
Phase 1 MVP · Q3 2026
Station hub + Shrine Quarter (3 zones minimum), 3 Claude NPCs, Stripe subscription, COPPA parent-first auth, progress stars, web export at 320×180 pixel-perfect scale.
Pivoted May 2026 from obsolete 3D Castle spec to 2D GuttyKreum — entire catalog already owned.
Universe
Studio edu anchor
Backend patterns proven in A Quiet Post quest API. MyTwoWives ships only after BFT stabilizes. Cross-legend: Yumi no Ko from Tsurune referenced in city lore.
Generational arc: ages 5–7 play arcade; 11–13 open shops; 14+ financial district doors unlock later — same subscription, deeper world.
