A girl comes there to become a dentist of dragon. She is with other new freshman applicants, but there is no announcement from a senior as a guidance. They are confused and taken along with the senior. The only way is just to walk through freshman's path, which is dark and strange. They do not know where they are. Not knowing what to do, she is approaching to the secret of dragon, but she does not realize yet. The adventure has already begun.

はるか未来。人類は地下シェルターの中で、徹底管理された生活を送っていた。「なぜ世界は滅び、人類はこのシェルターに籠らねばならなかったのか？」今日もヒストリー機関のメンバーは、過去の記録映像から世界滅亡の原因を議論する……たぶん。

A sleeping gigantic electric generation kaiju No.33, so-called Eleki-Magma, which the city relies on its electric power. One day, a mysterious giant robot Proto-Taitan appeared in the sky and destroyed the city! An accumulation of electricity, which lost its way in the body, has finally awakened Eleki-Magma!