What is Tsurukame Portal?
Tsurukame Portal (つるかめポータル) is a comprehensive educational platform serving learners in Japan and, increasingly, worldwide. It began as a hub for Japanese curriculum content — math puzzles, kanji practice, English exam preparation — and has grown into a full-featured learning ecosystem anchored by its flagship product, SciCirc.
The name "Tsurukame" (鶴亀) refers to a classic style of Japanese algebra puzzle — the kind of problem that demands you reason from first principles, not from memorised templates. That spirit runs through everything we build: we want learners who can think, not just recall.
Our Mission
Our mission is straightforward: make Learning by Teaching accessible to every student, regardless of budget or geography. We believe that the most powerful learning experience is not watching a lecture, not reviewing flashcards, and not even having a great teacher answer your questions — it is being forced to articulate your own understanding to someone else.
Every feature is designed to put the student in the teacher's seat. Explanation, not consumption, is the core activity.
Our pedagogy draws on Bloom's 2-sigma research, the Protege Effect, and cognitive load theory — not edtech trends.
We don't gamify mediocrity. SciCirc gives candid, specific feedback on the quality of your explanations.
The Philosophy: Why Teaching Works
In 1984, educational psychologist Benjamin Bloom published what became known as the "2-sigma problem." His research showed that students taught one-on-one by a human tutor performed two standard deviations better than students in conventional classroom settings — a result so dramatic that Bloom called it the "most striking" finding of his career. The problem, of course, was cost: individual tutoring at scale is economically impossible.
Around the same time, research on the Protege Effect was accumulating: students who prepared to teach material to others — even imaginary others — retained that material significantly better than peers who simply studied it. More recently, a 2018 paper in Learning and Instruction showed that learners who expected to teach a text recalled it more effectively than those who expected a test.
SciCirc applies these findings in a single, scalable interface: an AI that responds to your explanations, challenges your reasoning, and tracks where your understanding is solid versus superficial. It is not a novelty. It is applied cognitive science.
How We Differ from the Incumbents
Khanmigo and similar AI tutors are fundamentally Q&A systems: the student asks, the AI answers. That is a useful service, but it keeps the student in a passive receiving role — exactly the cognitive posture least likely to produce durable learning.
Quizlet and flashcard-based apps improve short-term recall through spaced repetition, but recall and understanding are not the same thing. A student can recognise a correct definition on a card and be completely unable to apply the underlying concept to a novel problem.
Duolingo gamifies micro-tasks beautifully, but its core loop rewards completion, not comprehension. Progress streaks and hearts are engagement mechanics, not learning mechanics.
SciCirc's core loop is different at the level of the interaction itself: you speak, the AI listens, asks follow-up questions, and evaluates whether your explanation reveals genuine understanding. The cognitive load is on the learner — by design.
The Founder
Tsurukame Portal was founded by a high-school student in Japan who became frustrated with the gap between what existing apps promised and what the science of learning actually supported. At 18, having spent years building educational tools for his own use and for classmates, he formalised the project as a platform and set out to answer a simple question: can an AI system replicate the transformative experience of being forced to explain something?
He is currently completing his secondary education while preparing an application to Keio University's Faculty of Policy Management — a programme known for its project-based, interdisciplinary approach. Tsurukame Portal is both his senior thesis and his company.
What's Next
We are actively expanding SciCirc's subject coverage, refining the AI's ability to distinguish surface-level explanation from genuine conceptual mastery, and opening the platform to learners beyond Japan. An English-language interface is in active development.
If you are an educator, researcher, or edtech professional interested in what we are building, we would genuinely like to hear from you. Get in touch.