@Kaizou:
Isaya Hajime (author of Shingeki no Kyojin) going to release the one shot, called The Killing Pawn, on Issue 36/37 of Shounen Magazine; the illustration is by Minagawa Ryouji (illustrator of Arms; author of Peace Maker).
http://mantan-web.jp/2014/07/29/20140729dog00m200009000c.html
–- Update From New Post Merge ---
Shounen Magazine Issue 35:
Nanatsu no Taizai (Cover, Lead CP)
Fuuka
UQ Holder!
Daiya no Ace
Yamada-kun to 7-nin no Majo
Fairy Tail
Aho-Girl
AKB49
Koe no Katachi
Acma:Game
Days
Kindaichi Shounen no Jikenbo R
Ryuusei Kyuushi (CP, One Shot)
Baby Steps
Ahiru no Sora
Corpo Shitsurakuen
Hajime no Ippo
Domestic na Kanojo
Wagatsuma-san wa Ore no Yome
Kamisama no Iutohri Ni
Repo Damashii!
Tenkei no Arimaria
Sekkachi Hakushaku to Jikan Dorobou
Area no Kishi, Seitokai Yakuindomo (Absent)
Shounen Magazine Issue 36/37:
Lead CP: Tetsu no Ou (New Series by Sano Ryuu)
One Shot: The Killing Pawn (by Isayama Hajime (story) and Minagawa Ryouji (artwork)), Bay Max (comicalization of Big Hero 6; by Ueno Haruo)
Special Chapter: Tsurezure Children
That character design by Minagawa Ryouji looks a bit like Hayato Shingu from ARMS