does anyone knows good straight age gap manga??? anyone?

http://www.mangago.me/read-manga/back_to_the_highteen/
http://www.mangago.me/read-manga/yamada_kun_to_lv999_no_koi_wo_suru/
http://www.mangago.me/read-manga/toshishita_yankee_wo_oseru_ken/

Tsubaki chou lonely planet
Living no matsunaga san
Fruits basket (not the main couple)
Gekkan shoujo nozaki kun (not the main couple)