While resting in a bamboo forest, Ginko is approached by an odd man named Kisuke, who tells Ginko that he has been lost in the forest for 3 years. Ginko seems to have also become lost, and decides to go off and figure something out about the forest. After managing to get out of the forest, Ginko figures out that it's the work of a "Magaridake".

A lady named Aki discovered a green stain on her wedding gown, one year later she gave birth to a boy who, now grown up, has the same marks on his body. It turns out that the boy was originally born not as a human but as some shapeless green blob, which then turned into a human. Her husband asks for Ginko's help yet he is unable to save her son because it's the work of a "Watahaki".