You will meet Masuo's character in Mayscape Aparment. He will get you an update for Poker Game adding one girl and nerfing Rose. But there is a little cheating with her.
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You can see her cards by clicking it 3 times or more.
Why not? She will be rewarding you with best item in the game. Although it's not implemented in game but you will get that item later just by talking her if you defeat her now.