umm... are these manga have any prequel?

this one : http://www.mangago.me/read-manga/sayonara_futaribocchi_renai_shinsho/

and ch. 1-2 of this: http://www.mangago.me/read-manga/koi_to_wa_baka_de_aru_koto_da/

story of the Nao's and Taichi's friends, basically the whole crew is gay hahahahaha

hahaha thanks so much ლ(´ڡ`ლ)