Game mechanics, Part 1:
Basically, you're flying across the screen - the farther you fly, the more is your score.
You can use "Aerial" attacks to control your character mid-air, as described in game instructions.
When you hit the ground, you slow down. Your speed depends heavily on your flight angle and boosts received.
There are characters standing at each 10 meters - landing on them has various following effects:
Youko = Purple girl
Usual action: prevents you from hitting (on) a next girl. Does nothing if you land on a guy.
Special action: activates a special "CFF" mode, in which character gains various ablilties. Effect depends on the girl you land onto. Bonus lasts while your character has different colour.
Special condition: a tricky one. You must fall onto any girl while Youko's "block" is replaced with "VS C.F.F." text. Basically that text appears on every 10th character you fly by.