The magazine had already announced in June that the manga would climax this month. For his part, Nogi began publishing the spin-off manga in Kadokawa publisher's Monthly Comic Dengeki Daioh magazine in April 2017. The publisher published the third compilation volume in July 2019 and will publish the fourth in October this year.
It is worth mentioning that this is a spin-off manga derived from the manga written and illustrated by Motoi Fukuyama, Toaru Kagaku no Railgun, which is inspiring the third season of his anime adaptation, now broadcast.
Synopsis for Toaru Kagaku no Railgun Gaiden: Astral Buddy
Hokaze Junko, one of the best "maidens" of Shokuhou Misaki, has always mixed at the Tokiwadai fon, an easy feat when attending a school for powerful girls. However, when a ghostly figure begins to stalk her, Junko suddenly becomes the center of attention. As Junko investigates her stalker, she will begin to learn new things about her peers ... and about herself!
Source: Monthly Comic Dengeki Daioh September issue
鎌 池 和 馬 (原著), 乃 木 康 仁 (著), は い む ら き よ た か (イ ラ ス ト, デ ザ イ ン) / KADOKAWA
