Want to know why I hate it? Canvas 2. Fuck that show. [ Not only is it an incest ending, they waste a tremendous amount of time with the childhood friend route before the male lead has some kind of random epiphany with zero setup of development for it, and lo and behold, he and his much younger cousin are naked in bed in France. ]
Normally, I'd say fuck it and leave it as an open spoiler, especially on a series from 2005, but I'm too nice of a person. You know the ending anyway since I'm linking it to incest, but seriously, fuck that show. Myself;Yourself wasn't that bad because they knew it was fucked up.
I hated Nazuka Kaori for quite a while because of this series, through Eureka 7, True Tears, and Code Geass, until Soul Eater. Tsubaki ftw.