Since I don't have direct knowledge of this 'maman visual novel', we can make some general assumptions. Visual novels usually have a plot, characters, and a setting. Given the name'maman', it could be about a mother's love, her sacrifices, and how it impacts the other characters in the story. It might also explore different cultures' views on motherhood, presented through the medium of a visual novel with its own unique art style and narrative techniques.
Well, without more information, it's hard to say precisely. However, if we consider the term 'visual novel', it's often a form of interactive story. 'Maman' gives the hint that it may focus on maternal aspects. Maybe it tells the story of a character's growth under the influence of their mother, through various events and interactions that are presented in a visual and narrative form.