Ai ga Matteru
Part of a series of interconnected stories & characters: 1. Ubawareru Koto Marugoto Zebu (2009) [1st story Main characters are Yoshinaga (seme) & Takao (uke)] http://www.mangago.me/read-manga/ubawareru_koto_marugoto_zenbu/ https://www.mangaupdates.com/series.html?id=47014 (info on series) 2. Suki Toiunoni Nazekashira (2010) [1st story mc are Takehisa (owner of cafe Yoshinaga works at; seme) & Yuuichi (chef at cafe; uke)] [2nd story is Yoshinaga & Takao] http://www.mangago.me/read-manga/suki_toiunoni_nazekashira/ https://www.mangaupdates.com/series.html?id=55816 2a. Weak Sadist (?) [special oneshot released about Yoshinaga & Takaeo at end of Suki Toiunoni Nazekashira] https://www.mangaupdates.com/series.html?id=97767 3. Furikaette Mite Mireba? (2012) [1st story has cameo of Takao from Ubawareru Koto Marugoto Zebu] https://www.mangaupdates.com/series.html?id=75290 4. Ai Ga Matteru (2013) [full volume is about Kiyohito from Suki Toiunoni Nazekashira & Hisashi] http://www.mangago.me/read-manga/ai_ga_matteru/ https://www.mangaupdates.com/series.html?id=100153 5. Ai ga Aru Kara Ii ja Nai (2014) [cover seems to have Yoshinaga & Takao] https://www.mangaupdates.com/series.html?id=109757 6. Itsumo Anata no Koto Bakari (2015) [1st story MC is Takeshia & Yuuichi from Suki Toiunoni Nazekashira] https://www.mangaupdates.com/series.html?id=124138
The Killer