Character stats - all the crunchy bits that describe the MC.
Experience and Thresholds - Your stats go up with use, but to unlock higher values you need to trigger key events to raise your associated threshold
Chastity - Information about what you can do about chastity belts in this game
Secretary Styles - All the varied ways one can change over the course of your tenure at SISSI (and how to achieve them).
Makeup Styles - Information about the cosmetics you can find in this game. As well as any effects they may have.
Money - Credits make the world go 'round.