* Time Travel Shoujo is based on a 1983 book titled Jishaku to Denki no Hatsumei Hakken Monogatari by Japanese educator Kiyonobu Itakura. It is part of the Hatsumei Hakken Monogatari Zenshuu series which describes the story of various scientific discoveries and inventions throughout history. The 1983 book focuses on discoveries related to magnetism and electricity.

Hayase Mari is the daughter of a scientist, Eiji, who vanished three years ago. He left behind a pendant known as the armillary compass. One day, after coming across a mysterious book, the compass glows and sends Mari back in time. Supported by her best friend Mizuki Waka and Waka's brother Shun, Mari travels through time in search of her missing father and along the way meets famous scientists who changed the way people think about electricity.

Source: Wikipedia

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