hello there

1. http://www.mangago.me/read-manga/you_re_my_loveprize_in_viewfinder/
2. http://www.mangago.me/read-manga/asterisk/
3. http://www.mangago.me/read-manga/hero_heel/
4. http://www.mangago.me/read-manga/hanaya_no_nikai_de/
5. http://www.mangago.me/read-manga/ten_count/
6. http://www.mangago.me/read-manga/michiru_heya/
7. http://www.mangago.me/read-manga/crimson_spell/
8. http://www.mangago.me/read-manga/gohou_drug/
9. http://www.mangago.me/read-manga/coda/
10. http://www.mangago.me/read-manga/doushitemo_furetakunai/

Hope this helps! All of these mangas share similar characteristics to those that you have mentioned; in terms of being long and elaborate in terms of storyline and contain nice art as well as unique plots. ヾ(☆▽☆)

maybe the story it's like...
totally captivated:
http://www.mangago.me/read-manga/running_on_empty/
http://www.mangago.me/read-manga/ore_ni_koi_shite_dousunda/
http://www.mangago.me/read-manga/itazura_neko_ni_goyoujin/
junjou romantica(older seme makes tsundere uke loves him): http://www.mangago.me/read-manga/ousama_ni_kiss/
kuroneko I have no idea because do you mean the plot, cats or shapeshifter? all together is difficult

THankk you ヾ(☆▽☆)

well I v read most of them but there are still some new ones thank youu ⌒▽⌒

Those are some interesting mangas