Beautiful. This manga really had me wrapped up in everything these characters were going through from the first panel. When I read the initial synopsis I thought this strange taboo of a girl dating her dead sister's fiancee would be hard to get past, but how Natsumi and Togo get wrapped up in this guilt, and this feeling of being left with a curse was gutwrenching to see unfold. It's almost like the romance intended took a back seat to focus on the grief felt, and ultimately just showed how much Natsumi loved her sister. These moments of confusion and feelings of deceit are written and drawn so well I couldn't help but sympathize with that gut-wrenching emotion.
It's a shame Haru no Noroi hasn't picked up more attention from manga readers, I assure you this isn't something you want to skip.