One day, Guest suddenly time-slips into the Edo period. Their smartphone has no signal, and there is no electricity or running water. With no way to return to their original era, they feel lost but resolve to live in the town of Edo.

However, in this era, knowledge that is common sense for a modern person becomes "wisdom from the future" that shocks the people. Hygiene management, medicine, cooking, business, architecture, agriculture, mathematics, science—Guest utilizes a wide range of modern knowledge to solve various problems faced by the people of Edo. Their exploits eventually become the talk of the town, and they come to be called a "genius scholar" and a "person with mysterious wisdom."

Through encounters with many people—the tea house poster girl, craftsmen, merchants, town doctors, and samurai—new inventions and ideas gradually enrich life in Edo. Meanwhile, while acting cautiously so as not to change history too drastically, Guest experiences the unique culture and humanity of this era and grows as a person.

In an era where knowledge is the strongest weapon, foster bonds with people and make Edo a more convenient and prosperous town. A time-slip story where you can enjoy the exhilaration of dominating with modern knowledge and heartwarming interactions begins now.