Series

2nd Book: Henai Prince [Spin off]
http://www.mangago.me/read-manga/henai_prince/

3rd Book: Unmei Nanosa [Spin off]
http://www.mangago.me/read-manga/unmei_nanosa/

2nd: http://www.mangago.me/read-manga/kuroneko_kareshi_no_amaekata/
3rd: http://www.mangago.me/read-manga/kuroneko_kareshi_no_nakasekata/
4th: http://www.mangago.me/read-manga/kuroneko_kareshi_no_itoshikata/
5th[SS]: http://www.mangago.me/read-manga/fukigen_kareshi_no_nadamekata/
6th: http://www.mangago.me/read-manga/kuroneko_kareshi_no_afurekata/
7th: http://www.mangago.me/read-manga/kuroneko_to_kareshi_to_ouji/
8th[SS: http://www.mangago.me/read-manga/fukigen_kareshi_no_saraikata/
9th: http://www.mangago.me/read-manga/kuroneko_kareshi_no_arukikata/

2nd Book: K-sensei No Yaban Na Renai
http://www.mangago.me/read-manga/k_sensei_no_yaban_na_renai/

3rd Book: K-Sensei no Furachi na Junai
http://www.mangago.me/read-manga/k_sensei_no_furachi_na_junai/

4th Book: K-Sensei no Himitsu no Netsujou
http://www.mangago.me/read-manga/k_sensei_no_himitsu_no_netsujou/

2nd Book: Real Account II [Seems more like the actual story]
http://www.mangago.me/read-manga/real_account_ii/

2nd Book: Sabita Yoru Demo Koi Wa Sasayaku
http://www.mangago.me/read-manga/sabita_yoru_demo_koi_wa_sasayaku/

3rd Book: Renai-rubi no Tadashii Furikata
http://www.mangago.me/read-manga/renai_rubi_no_tadashii_furikata/

4th Book: Narrow Place (Collection) [Extra]
http://www.mangago.me/read-manga/narrow_place_collection/

5th Book: Hadakeru Kaibutsu
http://www.mangago.me/read-manga/hadakeru_kaibutsu/

1st Book: After Morning Love
http://www.mangago.me/read-manga/after_morning_love/

3rd Book: Crossover Love
http://www.mangago.me/read-manga/crossover_love/

Extra 1: Tomodachi ni narou
http://www.mangago.me/read-manga/tomodachi_ni_narou_tadaima_okaeri_dj/

2nd Book: Tadaima, Okaeri Kagayaku Hibi
http://www.mangago.me/read-manga/tadaima_okaeri_kagayaku_hibi/

Extra 2: Yamashii Imi Toka Arimasen
http://www.mangago.me/read-manga/tadaima_okaeri_dj_yamashii_imi_toka_arimasen/

Extra 3: Oni Taiji!
http://www.mangago.me/read-manga/tadaima_okaeri_dj_oni_taiji/

[Prologue of Book 1]

Book 1: Itou-san [Main Story]
http://www.mangago.me/read-manga/itou_san_kuraka_sui/

1st Book: Sugar Pain
http://www.mangago.me/read-manga/sugar_pain/

2nd Book: Kobi No Kyoujin
http://www.mangago.me/read-manga/kobi_no_kyoujin/

3rd Book: Bi No Kyoujin: Smoke
http://www.mangago.me/read-manga/bi_no_kyoujin_smoke/