月刊別冊少年マガジン [Gekkan Bessatsu Shōnen Magazine] [Monthly Separate Shonen Magazine]

A short-lived but notable Kodansha anthology, Gekkan Bessatsu Shōnen Magazine ran for 58 issues from 1969 to 1974, offering a separate monthly companion to the main Weekly Shōnen Magazine. It served as a launchpad for distinctive series during a fertile era for manga, most famously introducing the work of Go Nagai, whose groundbreaking titles like Abashiri Ikka and Kekko Kamen first appeared here. The magazine's brief run still holds interest for its role in showcasing the early, unfiltered energy of a generation of creators who would define 1970s manga.