Rurouni Kenshin, Volume 3: A Reason to Act (Rurouni Kenshin #16-22)

"Spider's Web"... like ordinary opium, but better processed. Half the cost to produce, but twice the profits! To the people of Aizu, Takani Megumi was a daughter in a famous family of doctors, in which everyone - women and children alike - studied medicine. But to grasping industrialist Takeda Kanryû, she is the hen who lays the golden egg - the only one who knows the Spider's Web formula! To stay with Kanryû is to send even more to their deaths. But to stay with Kenshin and the others is to invite theirs...