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Having the "mark of S" means to have all 200 of the Standard Chips.
possession of all standard chips
get all standard battle chips
you have to get all standard chips
get all 200 chips
You have to get all 200 standard chips to pass through the 2nd door. After you pass through that, Bass SP should be all the way at the end.
You have to have all of the standard chips in your library. Only then will the door open and you can move on in the graveyard.
Serenade is in the Secret Area 3, up the gigantic slope. You'll also need all 200 standard chips. Equipping the Collect program is probably a good idea.
you beat acid ace R and dread joker R and get all standard chips
First you must get all 6 Soul unions to get in the area were he is, then you must get all the standard chips to fight him
Serenade is in Secret Area 3 behind the door at the top of the gigantic slope. This will not be accessible until Alpha has been defeated and the door will not open unless you have all 200 standard chips, so get crackin'.
you can get all standard chips from the red chip trader once you do etheir 4 or 5 continues the chip trader is at electown thanks for reading