Lose
When you're in prison, whoever ends up with the shellfish will lose. It's the game all prisoners play. It's like keep away from the shellfish. And if you end up with the shellfish BZZZZTT that's it, you're the loser.
Imagine that it's your first day in prison. You're walking around the yard, minding your own business, when suddenly a shellfish smacks you right in the head and falls into your open hands. "HAHA YOU LOSE!" someone shouts.
ふ
ま, お
None
If you lose, you're a fool (ふ). All you had to do was not hold the prison shellfish. It really shouldn't have been that hard to not lose, ya fool.
Now you have to try to make some other fool lose. Otherwise you'll be the loser fool forever.