My Slave Is Way Too Cheerful

My Slave Is Way Too Cheerful summary:

Roland is known throughout the world as the Black Knight. He appears calm, cool, and collected on the outside, but secretly he’s anything but - he can’t talk to girls for the life of him.

One day, while doing his regular heroic thing, he comes across a slave girl bound and gagged. Roland suddenly realizes - if he saves this slave girl, he can slowly build up his social skills by talking to her. After all, a slave girl has to be as shy as him, right?

Okay, now read the title again.