Like a previous reviewer has said the premise of the story is pretty common. The male assumed love interest has some sort of disease and knows he's going to die. Where this differs from other plot lines alike I think is the tone of the manga. The tone unlike others of the same kind of theme is a lot more light hearted. Obviously death and disease being the main theme its still slightly depressing but in a more bittersweet way than a pessimistic way.
One of the nicest things about the manga was the way in which the main characters are characterized. The protagonist is
a little more interesting than other protagonists in shoujo manga while she isn't one of the more typical crying and dependent protagonist she isn't one of the counter-typed, outlandish strong female leads either. She is definitely an interesting character. The same can be said for the main male lead he is also interesting, I wouldn't want to spoil anything about his character but he can come across as a typical 'bad boy' type of character to begin with but he is anything but. Let's say he is more of the typical dependent female protagonist then the main character is.
Though there is an over arching plot and some longer plot lines it is mainly written in a kind of episodic way, each chapter having a different plot line within the larger over arching plot. In some ways its better this way and other ways it not. If you like the kind of episodic way mangas like Usotsuki no Lily is written you may enjoy this one for the same styling.
Based on the fact the manga has yet to be translated completely into English is still ongoing I don't really have a good idea of the entire story but I am liking where it is going. There are a few complexities to the plot that could be explored further that I am looking forward too however there are already 6 volumes of the manga and I don't think given the number of volumes that the plot and story will continue to consistently well written.
In general the art style is quite nice. The characters don't seem to have much variety between being bishounens and bishoujos but despite this its generally quite pretty(?) to look at. Not really fond of how the adults are drawn they all seem to look no older than their mid-30's, where they should look a lot older especially in comparison to the main characters. eg. The protagonists mother looks more like her sister. The art is above average regardless and in collaboration with the well written story and good characters I would say overall, this a good if not very good manga.
3 chapters on update:
Some extra characters have been introduced to develop the plot albeit in a quite cliche way, still enjoying it regardless.
There was a really endearing very short one-shot extra (chapter 9.5) would seriously recommend you don't skip it, made me laugh. Wouldn't have minded a series about them, given that the protagonist was changed a bit. (She was kind of if not very annoying)