Story 1) Hen Ai
Part of a series of oneshots in anthologies.
1) Hen-Ai in Henai
http://www.mangago.me/read-manga/henai/
2) Henai: Maotokohen in Yajirushi
http://www.mangago.me/read-manga/yajirushi/
http://www.mangago.me/read-manga/henai_maotoko_hen/
3) Henai Fumou-hen in Poji
http://www.mangago.me/read-manga/poji/
http://www.mangago.me/read-manga/henai_fumouhen/
Story 2) Tomari Ki (Torch)
Story 3) Messiah no Yakubi (Messiah's Bad Day)
Part of a series of oneshots in anthologies.
1) Messiah no Yakubi (Messiah's Bad Day) in Hen AI
http://www.mangago.me/read-manga/henai/
http://www.mangago.me/read-manga/messiah_no_yakubi/
2) Messiah no Kyōjitsu (Messiah's Unlucky Day) in Poji
http://www.mangago.me/read-manga/poji/
http://www.mangago.me/read-manga/messiah_no_kyojitsu/
3) Messiah no Sentaku (Messiah's Choice) in Poji
http://www.mangago.me/read-manga/poji/
http://www.mangago.me/read-manga/messiah_no_sentaku/
Story 4 - 6 are connected
Story 4) Ore no Doukyuusei ga Binkan Sugite Yabai!
Story 5) Ore no Doukyuusei ga Kagen wo Shiranakute Tsurai
Story 6) Ore no Doukyuusei to Yasumi Jikan no Yuukou Katsuyou
Story 7) Kyoushitsu no Yugami
Part of a series:
1) Kyoushitsu no Yugami in Hen Ai
http://www.mangago.me/read-manga/henai/
2) Yugami Haime in Yajirushi [prequel story]
http://www.mangago.me/read-manga/yajirushi/
Source:
Henai (2014)
https://www.mangaupdates.com/series.html?id=107675
Yajirushi (2015)
https://www.mangaupdates.com/series.html?id=119428
Poji (2016)
https://www.mangaupdates.com/series.html?id=131578
Henai