All you have to do is just cleaning out all dirty icons by dragging over them within the time limit.
There are 5+1 dirty icons and each of them can be cleaned by the corresponding Cleaning tools.
[CHARACTER]
.Name: Maki
Height: 160 cm
Three sizes: 103/64/98
Characteristics: cheerful, kind, a little S?
Features
Easy-to-play design
20 stages
20 adult CGs
No cleaning, No hentai