I'm not really sure what to do next.

After I won all the money from Nishinotouin last week, my checklist from earlier doesn't necessarily give any answers, providing a vague "Defeat the other members of the student council." Which member should I try to defeat first?

I decide to head on over to Mary while she's dealing, and I end up helping her by being at another table. "Hey Mary, what should I do now?"

"I'm not sure," Mary replies. "Just pick a student council member and start gambling."

"Which one, though?"

"If you want my answer, I'm pretty sure Ikishima has the lowest net worth of all the council members. Her games can get pretty violent, though."

"Thank you. I guess I'll end up doing that. Just make sure we're paying all of the room fees in time."

"Got it." Mary must be tired. She's been dealing for the past two hours now. As I leave the book room, I hear Mary say "Blackjack, dealer wins" as the group of betters let out a vague moan of defeat.

I'm not really sure where Ikishima's club room is. She calls herself the "Beautification Chair" or something like that, but I have no idea what it means. I'll use my official match if I have to; I just want to get this over with. I hear she's not a very friendly character.

I look around the school to find where Ikishima might be. I heard she's in a very secretive place, but I'm not quite sure where that would be.

I check in the deepest recesses of the building to find her office, but she doesn't seem to be anywhere.

After about half an hour of checking for where Ikishima would be, I notice her walking with her assistants, and I try to be as secretive as possible when stalking her for where she's going, and I see her enter the library. The entire room seemed to grow audibly quieter as she entered the room, and she marches up to a girl playing Roulette and asks for her money. I'm pretty sure student council member's weren't allowed to use collection methods other than the house pet system, but Ikishima rarely plays by the rules.

After berating the girl about not having her money, she says she'll give her one week before she'll use "alternative force." Whatever it is, I'm pretty sure I wouldn't want to be on the receiving end of that "alternative force."

Ikishima leaves the library and heads with her posse to what I assume to be her lair. It's in an underground portion of the building with a large rusty staircase. As they unlock and swing open the door and walk down the staircase, I put my foot in the door as to enter without detection.