It's the second to last chapter of Arakure. At last it's revealed that Sachie is a Yakuza princess, and her best friend's mother can't handle it. What's poor Sachie going to do? This part of the story is pretty standard, dare I even say perfunctory -- well, let's just get it over with. There's also some nice moments with Rakuto :)
Link to Arakure Chp 55
I probably won't be able to get to the last chapter of Arakure until after the long Thanksgiving holiday. Sorry! I promise, though, it will be worth the wait :).
For those of you who want to buy the English translation of Arakure, it's published by Viz until the title "Wild Ones."