Okay then
Well it could start as one student finds the Dojo and it's inhabited by some strange Sensi who are presently teaching only one student

The Hook could be something like

Hanzo was nursing his bruises from the previous day while taking a back way home in an attempt to avoid any farther contact with the Boom Boom Boys who'd roughed him up
Hanzo had lived here his entire life and yet could remember never going down this street that seemed lined by shrines and walled homes of old design.
Sighing he looked around a moment relieved as he noticed that he was totally alone on the street.
"Well at least none of those thugs are around to cause trouble" he thought as he smiled feeling safe as he headed home.
Hanzo's relief was short lived though as the wall three feet ahead of him shattered then out of the hole flying across the street went a girl dressed in only a super short fighting outfit and landing in a pile of garbage bags.
An old man smelling of Sake and in bad need of a shave stuck out his head laughing as he said through slurred words
"Come on Girlie an fight or at least fly were I can see your panties"

The pile of garbage bags explode to reveal a very cute but angry girl with long snow white hair, curvaceous figure and a spinning 5 ft Bo Staff
"I'll break open your Skull for that Ecchi!" She screams then in almost a blur she fly back towards the hole and the old drunk who laughs and giggles as he dodges her frantic effort to hit him with her stick.

Other voices join in on the laughter as she swings the staff over and over but still can't find her target as he appears to stumble around in a random manner, that is till while leaping through the air the girl's short fighting dress blows up revealing that she's wearing red panties with tiny black bats covering them like polka dots

"Oh such pretty panties" he says as he stops dodging to gape at her.
Her staff strikes making a sound like a high caliber rifle
The others on the other side of the wall crack up as the old man groans but doesn't fall
His next move happens so fast that Hanzo only sees it's effect as the girls sent flying into a nearby carp pond to cool off an the old man stands rubbing his head were she struck as if it only itches.