About the Author: Masasumi Kakizaki is a manga author-illustrator born in Hokkaido known for the manga titles Rainbow: Nisha Rokubou no Shichinin, Spy no Tsuma, and Green Blood, Kansen Rettou. He received an award in 2001 for his debut short story "Two Top." In 2005, Rainbow: Nisha Rokubou no Shichinin received the 51st Shogakukan Manga Award and was subsequently adapted into an anime.

Format: Paperback | Pages: 224 | Publication Date: 2026-10-13