Tacchon, hina, maru and yasu all end up going to the dojo of champion grappler and needless to say hilarity ensues. Basically they were being taught simple techniques on how to take out a street thug/some punk harassing their girlfriend etc.
Here are some screencaps from the machijani clip.
WATCH TACCHON ABUSE HINA.
SEE MARU FALL ON HIS ASS.
OMG PEOPLE GO DOWNLOAD THIS. The machijani part was so awesome! I would especially recommend it to tacchon fans.
You can see it download it here - http://boneprincess88.livejournal.com/4652.html#cutid1
if you don't wanna read the recap then just scroll to the bottom and it's right there.
HAPPY DOWNLOADING! :D