This is the story of an aunt who inexplicably turns black and then returns to normal for one issue.
Just an idea, what would happen if the aunt becomes jealous of the brothers? If there are any similarities, it can only mean that the aunts are jealous because of Ni Ni's unparalleled elegance.
It's a diary style, with broken knives, and the knives explain the plot, so don't enter if you don't like it. Finished in one shot.
Conception: