Natsumi and Haru are sisters and they are the closest family to each other after their parents divorce and the father remarries. When they are teenagers, Haru starts dating Togo as part of an engagement in an arranged marriage. They are together for two years when Haru dies from a non-specified cancer. Later Togo asks Natsumi to go out with him and she agrees on the condition they go to the places he went with Haru. Thus begins a sort of relationship between Natsumi and Togo that isn't all that straightforward. This story probably falls under the josei genre of manga which is targeted at women. For the most part…