aka ito no shikkou yuuyo
kanawanu koi no musubikata (spin off of above)
i am cupid
I second aka ito no shikkou yuuyo
also:
Please Ms. Jem (shoujo)
Saiyaku wa Boku o Suki Sugiru (yaoi)
Kami-sama Darling (yaoi)
Kamisama x Oresama x Oyomesama (yaoi)
Akai Michi (shoujo)
Akai Ito (shoujo)
Koyubi wa Amaku Sasayaku (yaoi)
Megane-chan no Akaiito (shoujo)
I tried to search it but it’s not there?? You mind sending me a link
its kanawanu koi no musubikata, there was a typo ^^
Recommend some mangas where the characters are like soul mates or it has that red string type of plot