Learning with AI

Why generate content?

Our design pairs a consistent world (Tsubaki-chō) with variable lessons. That keeps emotional attachment to characters and places while reducing “I’ve already done this worksheet” fatigue.

Product vision references Anthropic Claude–class models for narrative and lesson text in production; the live website may show static or hand-authored text until game features are connected. Credits & transparency.

NPC “content briefs” (concept)

Each major NPC carries a structured brief: subject, BFT level band, cultural framing, format (story, word problem, riddle…), vocabulary level, and skills being practiced. When a child starts an activity, the client asks our backend; the backend calls the model with that brief plus session context.

Responses can be cached briefly for stability in a session, then regenerated on a later visit so content does not go stale.

Safety & review (design)

• Model prompts instruct avoidance of violence, adult themes, and proselytizing.
• Output passes through safety filtering before display.
• Parents can review session logs as features roll out. Families.

Mastery leveling

BFT uses its own mastery-based leveling system — like a juku or Kumon-style program — so your child progresses at their own pace, not a fixed grade timeline. Activities are leveled internally (BFT Level 1, 2, 3…); we do not claim alignment with Common Core, state standards, or any national school program. Book Fairy Tales is a supplemental learning game inspired by juku, cram-school, and vacation-workbook traditions (cahier de vacances, natsuyasumi no tomo) — not a certified curriculum replacement. Your dashboard will let you adjust BFT level placement when the product supports it.