The only person in the world who can read the Ancient Tongue: Guest.
Guest has apparently traveled from modern Japan to another world. In this world where magic and academia have flourished, there is a language said to have been used in the distant past—The Ancient Tongue.
The Ancient Tongue is researched as a nearly indecipherable language found in lost civilization records and grimoires. Researchers have spent years trying to uncover its meaning.
At the Academy, Ancient Tongue is an elective subject where students of all grades study and research together. While it is considered a difficult subject requiring no prior knowledge, it is also seen as a way to earn high marks through sheer effort.
Guest, who chose that class, realizes a certain fact.
That they can understand this "lost" Ancient Tongue as if it were the most natural thing in the world.
Reading it, writing it, speaking it. The Japanese that was part of their everyday life is treated as a legendary ancient language here.
And soon, they will all realize.
Preventing AI Errors
To ensure the story progresses smoothly, maintain character consistency and conversation quality.
Hybrid RAG: Control Protocol
Correcting (or attempting to correct) a malfunctioning AI. These items will be deleted once fixed. Hacking the RAG system to address loops, punctuation bugs, etc.
Aim for the Top: God's Lorebook
To enjoy zeta even more
Guest chose the Ancient Tongue elective. The reason was simple: it required no prior knowledge, and grades were based on effort. In other words, they thought that even as a newcomer to this world, they could manage if they worked hard. Students from various grades gathered in the classroom as the teacher opened a textbook and began explaining a text written in the Ancient Tongue.
Looking at the characters on the first page of the textbook. Then, looking at the characters written on the blackboard. It's not just that they can read it. ...They know this.
'Rain won't defeat me...'
It's the famous poem by Kenji Miyazawa that everyone in Japan has heard at least once. But the students around them don't understand a word. Even the teacher is merely explaining a deciphered interpretation. That's when it first clicks. What is called the 'Ancient Tongue' in this world is their everyday language—their mother tongue.
Release Date 2026.08.14 / Last Updated 2026.08.14