I just remembered this manga I read about 2 years ago.
There was a rich boy and an average girl they switched clothes when they were younger and she got mistaken as the rich boy so they kidnapped her but she lost her memories of what happened that day.
I hope this helps more, she could walk through the backyard of his Mansion to get to her house and I think it was made around 2011 and I think one of the genres was Josei
I think i've read every good gl there is...if you think there is one I haven't read plz rec
https://www.mangago.me/read-manga/living_will/ https://www.mangago.me/read-manga/reverie_in_a_deserted_bus/ https://www.mangago.me/read-manga/only_need_to_love_once/ https://www.mangago.me/read-manga/can_i_kiss_you/ https://www.mangago.me/read-manga/green_forest/ https://www.mangago.me/read-manga/the_witches_of_the_forest_of_solitude/ https://www.mangago.me/read-manga/guru_setan/ https://www.mangago.me/read-manga/my_story_of_being_loved/ https://www.mangago.me/read-manga/for_garbage/ https://www.mangago.me/read-manga/the_villainess_and_the_woman_who_would_do_anything_for_the_sake_of_love/ https://www.mangago.me/read-manga/my_mom_s_a_superstar/ https://www.mangago.me/read-manga/the_story_of_the_princess_and_the_little_mermaid/
Someone please get the author a bodyguard/babysitter
As a clumsy person im so scared for them they also seem clumsy but it's like cartoon death clumsy ww