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What a coincidence.....I just replied to a post below and the OP was looking for something similar. I doubt they were looking for this one but I'm sure you are :)
http://www.mangago.me/read-manga/life_is_money/
Thank you so much ε=ε=(ノ≧∇≦)ノ
You're welcome (≧∀≦)
Can you please help me find a manga?
It's about a boy who has a little sister. The sister has a rare dease, so needs a lot of money to cure it. One day, he receives a letter to participate a game to win a lot of money. So he does. He arrives in a room with other participant. The rule is ,I think, to lance a cube. After receiving the "number" you will either way lose one of your sixth sense or all or you're lucky and don't lose any of the sixth sense.(sixth sense= ability to see, move, speak, hear,...)
That's all I can remember. THX a lot in advance.
And Plz help me ╥﹏╥