All Digital Editions of the Manga Have Been Delisted as of 2019

(from ebookjapan):
A boy descends from the sky to a bullied child, Yasushi Yamada. He calls himself "Angel 2," a humanoid robot, and invites Yasushi to join him in exterminating bad guys, calling him "Angel 1. ......? In addition to the title story "Angel 2," this book is full of variety, including "Kamen Rider" and "Henshin Ninja Arashi" that appeared in toddler magazines, the newspaper serialization of "Android V," the TV animation "Spaceman Pipi," and an adaptation of the TV puppet play "Hyokkori Hyotan Island."