Miyoshi Seikai Nyuudou is a member of the Ten Crucifix Insects.
Like his brother Isa, Seikai is shown to be religious and thinks by killing humans, they are saving them
Not much has revealed about Seikai history.
Seikai has shown to be incredibly powerful and has great strenght. Seikai managers to carry hundreds humans with ease.
Koikawa Shungiku v/s Miyoshi Seikai Nyuudou