Just noticed that There isn't no Magazine issue 19 posted, but only the preview So here it is:
Magazine #19 (09/04): HKT48 (Cover)
Kindaichi Shounen no Jikenbo R (Lead Color Page, 25 pg.)
Baby Steps
Seitokai Yakuindomo
Kamisama no Iutoori II
Koe no Katachi
Fuuka
Namiuchigawa no Muromi-san
Daiya no Ace Fairy Tail (Color Page, 25 pg.)
Area no Kishi
Acma:Game Tomodachi Game (Special Chapter from Betsumaga)
Shingeki! Kyojin Chuugakkou (Special Chapter from Betsumaga)
Arslan Senki (Special Chapter from Betsumaga)
AKB49〜Renai Kinshi Jourei
Days
Nanatsu no Taizai
Seishun Shounen Magazine - Kami no Tsubasa
Professional Henshuusha no Yuugi
Yamada-kun to 7-nin no Majo
Ahiru no Sora Again!! (End)
Shinkai Tsuzuri no Dokkairoku
Soredemo Boku wa Kimi ga Suki
UQ! Holder
Aho Girl
Wagatsuma-san wa Ore no Yome
Chotto Morimashita。 Hajime no Ippo (Absent)
Sekkachi Hakushaku to Jikan Dorobou (Absent)
–- Update From New Post Merge ---
Magazine #20 (16/04):
Nanatsu no Taizai (Cover & Lead Color Page, Anime Ad, 44 pg.)
Baby Steps
Seishun Shounen Magazine - Kami no Tsubasa
Professional Henshuusha no Yuugi
Fairy Tail
Hajime no Ippo
Ahiru no Sora
Yamada-kun to 7-nin no Majo
Daiya no Ace
Koe no Katachi
Aho Girl (Color Page, 10 pg.)
Kindaichi Shounen no Jikenbo R
Days
Acma:Game
Fuuka
UQ Holder!
Wagatsuma-san wa Ore no Yome
AKB49〜Renai Kinshi Jourei
Area no Kishi
Soredemo Boku wa Kimi ga Suki
Kamisama no Iutoori II
Namiuchigawa no Muromi-san
Shinkai Tsuzuri no Dokkairoku
Sekkachi Hakushaku to Jikan Dorobou
Chotto Morimashita。
Seitokai Yakuindomo (Absent)