Ep. 21: Ginko investigates a child with a green rash and his four brothers
Aired on May 15, 2006

Ginko is summoned to examine a young boy suffering from a spreading green rash across his body. Upon inspection, he quickly determines that the child is not human. He further deduces that the boy's four brothers are also not human. This investigation focuses on identifying the true nature of the affected family members based on the physical symptoms presented by the child.
Episodes
- Ep. 17 · Ginko investigates the cocoon handler searching for her missing sister
- Ep. 18 · Ginko Investigates a Mushi-Infested Coat to Find Its Original Owner
- Ep. 19 · Ginko assists a girl who vanished after taking a mysterious string from the sky
- Ep. 20 · Ginko visits a library of mushi scrolls and hears a family curse story
- Ep. 21 · Ginko investigates a child with a green rash and his four brothers
- Ep. 22 · Ginko explores a village with a shrine rumored to grant another life
- Ep. 23 · Ginko investigates rumors that a girl causes strange rust in her village
- Ep. 24 · Ginko opposes the local mushishi's plan to burn the mountain to destroy the threatening mushi.
- Ep. 25 · A woman gains sight from a mushi but sees unwanted visions