It might be a romantic - comedy genre. The 'futari' (two people) aspect often lends itself well to comedic situations in love stories. And since it's a love story with a 'step up' which could imply some sort of development, it could have elements of humor along with the romance. For example, the two characters might get into funny situations as they try to move their relationship forward.
Since I don't know the exact details of 'futari ecchi step up love story', I can only make some general assumptions. In a love story, there is often an initial attraction between the characters. In this case, perhaps the 'futari' (two people) start with a certain level of connection, and as the story progresses, they 'step up' in terms of their emotional commitment. There could be plot twists, like misunderstandings or external factors trying to pull them apart, but ultimately their love story unfolds in a unique way that the title implies.
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Noir manga often has a dark and gritty atmosphere. The characters are complex and morally ambiguous. The art style usually emphasizes shadows and contrast.
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