Oedo Kagaku Sosa Hatchobori No Oyu [2] (Takarajimasha Bunko)

[Machine Translation] Yuuka Sekiguchi (Oyu), a former female office worker leading a double life in Edo and modern times, is asked by the owner of a habotai wholesale store to check whether her son is her own child. She says that she has received a letter from a birth attendant, Oko, who is an extortionist. Meanwhile, Denzaburo, a Doshin, is also looking into the whereabouts of Oko, while investigating the illegitimacy of a certain feudal lord. However, Oko's body is eventually discovered. The story moves back and forth between the two eras as it attempts to get to the bottom of the Okoritane riot!

江戸と現代で二重生活を営む元OLの関口優佳=おゆうは、小間物問屋の主人から、息子が実の子かどうか調べてほしいと相談を受ける。出生に関して、産婆のおこうから強請りまがいの手紙が届いたのだという。一方、同心の伝三郎も、さる大名の御落胤について調べる中で、おこうの行方を追っていた。だが、やがておこうの死体が発見され―。ふたつの時代を行き来しながら御落胤騒動の真相に迫る!