http://www.mangago.me/read-manga/dekichatta_danshi/ -Dekichatta Danshi
http://www.mangago.me/read-manga/mankai_darling/ -Mankai Darling
http://www.mangago.me/read-manga/lucky_number_13/ -Lucky Number 13
http://www.mangago.me/read-manga/hana_no_mizo_shiru/ -Hana no Mizo Shiru
i hope and you like any of these xx
http://www.mangago.me/read-manga/ringo_ki_kara_ochiru/
http://www.mangago.me/read-manga/natsu_kimi_ga_saku/
http://www.mangago.me/read-manga/niini_no_mori/
http://www.mangago.me/read-manga/konya_wa_take_out_nite/
http://www.mangago.me/read-manga/goshintou/ (2 vols.)
http://www.mangago.me/read-manga/tsukigasa/
http://www.mangago.me/read-manga/ochibure_shinshi_ni_ai_no_uta/
http://www.mangago.me/read-manga/shiawase_no_category/
http://www.mangago.me/read-manga/kabe_no_naka_no_tenshi/
http://www.mangago.me/read-manga/almost_paradise/
http://www.mangago.me/read-manga/mic_and_neo/ (2 vols.)
http://www.mangago.me/read-manga/memory_of_the_future/ (has a sequel. 2 vols.)
http://www.mangago.me/read-manga/kimi_ga_boku_no_subete/
http://www.mangago.me/read-manga/soul_kiss/
http://www.mangago.me/read-manga/kokoro_no_kagi_wo_mitsukete/
http://www.mangago.me/read-manga/nekrateholic/
http://www.mangago.me/read-manga/akudama/
http://www.mangago.me/read-manga/tenki_yohou_no_koibito/ (2 vols.)
http://www.mangago.me/read-manga/fujunna_renai/
http://www.mangago.me/read-manga/hanamai_koeda_de_aimashou/
http://www.mangago.me/read-manga/steady_study/
*I highly recommend the unpopular works above (and do check other works of those mangaka too).
http://www.mangago.me/read-manga/never_complex/
http://www.mangago.me/read-manga/kurumi_no_naka/
http://www.mangago.me/read-manga/gareki_no_rakuen/
http://www.mangago.me/read-manga/tengoku_e_ikebaii/
http://www.mangago.me/read-manga/tokyo_shinjuu_totempole/ (long-ish series)
http://www.mangago.me/read-manga/kayashimashi_no_yuuga_na_seikatsu/ (and Kigurumi Planet, Pretty Babies etc. are long series)
http://www.mangago.me/read-manga/mienai_hoshi/ (highly recommended. 2 vols. with the sequel)
http://www.mangago.me/read-manga/running_on_empty/ (2 vols.)
http://www.mangago.me/read-manga/nemureru_tsuki/ (2 vols.)
http://www.mangago.me/read-manga/roureville/ (3 vols.)
http://www.mangago.me/read-manga/j_no_subete/ (3 vols.)
Can anyone recommend me a kind of unpopular yaoi? I'd appreciate it if it was a bit on the longer side, but anything will do! Thank you in advance!