Hi, my pick today is the Shounen Slice of Life Gag manga "Hayate no Gotoku!" about an unlucky boy that was sold off to the yakuza by his parents to pay their debts.
When he is running from the yakuza he appends to save a girl.
This girl a rich girl later saves him from the debt but now he was to pay her by working as a live-in butler for her.

Description:

Hayate Ayasaki, 16, the world's unluckiest boy. Working hard as a child for food and school fees, his unemployed and indebted parents sold him to the yakuza for his internal organs. After temporarily escaping the criminals and contemplating the benefits of a life of crime, he was saved by a wealthy young girl; who now employs him as a live-in butler.