Any recommendations for a manga similar to rental oni chan or higehiro (thats the anime’...

I only know rental onii chan. Havent read the other one.
In terms of breaking heart you can try My broken Mariko

Thanks! Also you can watch higehiro on crunchyroll if you wanna check it out and just as a lil disclaimer all the romance is between consenting adults. The two main characters have a brother sister relationship

Oh thnx. I'll try checking it out