Hebi Musume to Hakuhatsuma

Takako and Miyako, daughters of an arachnologist father, have a new stepmother. At first they live happily as a newly-formed family, but in reality the stepmother plan to murder the whole family with spider poison for inheriting the family fortune. Takako is the first to be killed, but she then comes back to life as an old woman, and now seek to take revenge on her stepmother and to protect Miyako.

A girl is stuck in the body of an infant while her younger sister grows into a beautiful young woman. The manga tells the story of the older sister's plot to turn her sister's life into her own.

Mako Umezu, the little sister of the horror mangaka Kazuo Umezu, opens a strange fan-letter adressed to her brother. Inside the envelope, Mako finds the picture of a girl, two big snake scales and a letter from a girl named Youko Numeta, saying that those snake scales are in fact the scales of her step-sister, Kurumi.