Responses
Yeah, and you also need to read Suki Toiunoni Nazekashira before this manga, not only 1 & 3.
http://www.mangago.zone/read-manga/suki_toiunoni_nazekashira/tr/99477/page/53/
Oops, meant 1 and 2. 3 is the collection one that no one has scanlated yet.
1. Ubawareru Koto Marugoto Zenbu [2009]
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http://www.mangago.zone/read-manga/ubawareru_koto_marugoto_zenbu/
2. [spinoff sequel] Suki Toiunoni Nazekashira [2010] -
http://www.mangago.zone/read-manga/suki_toiunoni_nazekashira/
3. [spin off] Furikaette Mite Mireba? [2012] collection of short stories
4. [spinoff sequel] Ai ga Matteru [2013] - http://www.mangago.zone/read-manga/ai_ga_matteru/
5. [spinoff sequel] Ai ga Aru Kara Ii ja Nai [2014]
To understand what's going on in here I think 1 and 3 are all we need to read first.