Okay, I did my best with the translation, but I put it back into "check_translation" because, looking at the next one, I've either messed something up or there's something missing. Based on this comic, Hata no Kokoro wins with three aces, but looking at the next one, it seems like Cirno pulled off a straight somehow. Is it because "showdown" means they draw the fifth common card, which ends up giving Cirno a straight? I'm not a poker player, so...
Thinking carefully, it looks like my idea about the fifth common card is right...
Updated
*slide*ResolutionAll in.This match...And your hand has nothing at all, I'm sure of it! You lose this round!Here it comes!A bluff!All in--and I call!!Wha!?All right... if she's got aces, it'll be harsh--even queens would be. Normally, I should fold here.But what you "saw" is just a Fata Morgana. A Fata Morgana is a very specific type of mirage.*flash**swish*It was only an instant, but I definitely saw it!...Right now, she looked at the chips for an instant.DecisionHer lack of expression definitely makes this more difficult...Showdown!My hand is a pair of aces.A joyful mask...! But why...!?Well, I must thank you for seeing it...My hand is......two Jacks.Then, those hurried masks I saw--she did it on purpose!! She led me on...But if I do that, my remaining chips will...I win this one!This is...