Phoenix Kazetaro

(from ebookjapan):
An adventure story about a firebird, Ishinomori's debut work for a kashihon An apple tree bears golden fruit once every three years. The apple tree bears golden fruit once every three years, but the apples have been stolen! The angry lord orders his three sons to find the culprit. While his two older brothers fail, the youngest son, Kazetaro, discovers that the culprit is a firebird and sets off on a journey in search of the firebird... The collection includes the title story and "Take Off That Mask! published under the name Fujitaro Ishizuka.

Note: Digital edition is grayscaled from the Shogakukan Creative reprint.