Corruption of a good man

A young beggar was taken in by a newly anointed aristocrat family. The young boy was fed and treated like one of their own. Growing up, he wanted to repay the family that took care of him as much as he could. However, during the coming age ceremony, in which inhabitants of this world can be granted a 'class' when they reach 16, the hope for his first step for reciprocating the goodness that was showered to him starts to be out of reach.
* Class Granted *
Netori

Slow paced story
1 chapter every 3 days