One day, Yuka Sekiguchi who is working at a real estate company, had to take over her grandmother's house and was asked to check for a hidden closet. Due to curiosity, she looked for it and found the hidden closet where she suddenly slips back in time to Edo clueless. She then meets Ukai Denzaburo, a policeman at Minamichi Police Station, who got her involved in an investigation of a murder and asked for her advice during the investigation due to his poor reasoning skills.

在江户时代×科学搜查的组合下诞生出穿越推理的新世界：在现代过着普通生活的女性，一边自由地穿梭于现代与江户之间，一边运用科学技术向江户时代的棘手案件发起挑战。化身“阿优”的关口优佳是否能够披荆斩棘，最终找到真相呢？

在江戶時代×科學搜查的組合下誕生出穿越推理的新世界：在現代過著普通生活的女性，一邊自由地穿梭於現代與江戶之間，一邊運用科學技術向江戶時代的棘手案件發起挑戰。化身“阿優”的關口優佳是否能夠披荊斬棘，最終找到真相呢？

対照的な時代ミステリーと科学捜査を融合させ、時をかけるＯＬの名推理を描く意欲作。