Also,
@Maugan Ra , are their modifiers for how convincing a story we tell? I mean, like, no matter how well we roll, "I was just sleeping in my bed all day" is less convincing than, you know, an actual explanation.
There are indeed modifiers to these sorts of tests. This might mean dice added or removed from the pool, free raises granted for a good story or extra ones required for achieving a more specific effect, etc etc.
If you're telling the truth, the whole truth and nothing but the truth, you'd probably be looking at a flat TN to appear convincing. If you leave some details out or deliberately lie, you're looking at opposed rolls with the Investigation pools of everyone who doubts you (including the Kitsu magistrate standing behind you).
True, I'm just wondering, how vital is convincing her. Like,
@Maugan Ra , can we do some sort of Lore/something check? If we actually manage to convince her that we're not lying and we have an alibi, how far would that go in clearing us of the charges? I mean, she's really powerful and really in charge, but I'm not sure HOW in charge.
Lore: Law/Intelligence 5k4 = 26
If Matsu Ketsui believes you are lying or not telling her the entire truth, she can and will throw you in a dungeon to be tortured until you confess. Rokugani law requires a confession for any sort of guilty verdict (though someone who loses a duel or gets killed 'resisting arrest' is generally treated as having confessed to the crime anyway), and confessions extracted under torture are considered entirely valid.
Your status as a guest and a samurai offers you some protection, but this is still Shiro Matsu, and the Daimyo's word is law. By virtue of her high status, just about anything she does to you in her territory is
de facto legal. You aren't really important enough for the Scorpion to go to war over if she kills you, and if you are convicted of a crime the Scorpion themselves would be seen as wrong for protesting. About the best you could hope for is being allowed to commit
seppuku instead of being tortured to death.
If, on the other hand, you can convince Matsu Ketsui that you
are innocent, you're basically set. If she proclaims that you had nothing to do with it, anyone who says otherwise or continues to investigate you is essentially calling her a liar. Which is not a healthy thing to do. She is unlikely to make any such judgement on the basis of your testimony alone, and may not make any formal judgement at all, instead accepting the testimony of her magistrates, but that you be the ideal end result here.