Q.E.D. -- Teen Detectives

Hayakawa Yui is a young girl whose biggest quality is to be a fast runner. She accidentally travels through time up to the Sengoku Era and falls in love.

The drama is depicting the life and times in 17th and 18th century Japan during the rule of the eighth shogun, Tokugawa Yoshimune.

Silent poor... the poor and needy whose cries for help are drowned out in today's busling society. Their existence is spreading rapidly across the nation, and as such, the government decided to set up a body to help them. Nationwide, there are now people called Community Social Workers (CSW), and their jobs are to attend to the poor and needy. One such person is Satomi Ryo, and she works at the Shitamachi area's Council of Welfare. The people that she meets in her busy working life are people afflicted with juvenile dementia, those who have shunned society and locked themselves up in their rooms, the homeless... generally people who are in despair over life and the fate dealt to them. Ryo herself had been down the lonely road before, and as a way to pull herself out of her depression, she decided to work as a CSW, in order to help others like her. She strongly believes that one can always start all over again, and it is her belief that helps her to move forward in life.