Sono Kuchibiru ni Yoru no Tsuyu
Complete | fukai youki | 2006 released
this one will definitely get you thinking about their relationship, like its inception and development. I am not sure that I am okay with how the story unfolded, but it kept me engaged the entire time. I kept thinking "I know where this is going" and being wrong super fast. Like other people said this one is surprising at various points and bittersweet in the end.
Nichijousahan Bi - Beautiful Life