Ethically id say this is a far cry from extortion, shes literally paying off her debt with things like hugs and gaming together, shes not forcing anything and the main character has definitely never been made uncomfortable or been raped as some people are claiming, you can still say no and not participate after a few beers as she had in this manga, she surely wasnt black out drunk, she was an active participant.
You cannot claim rape after a consensual activity either. Thats like lending someone your pen for a day and then claiming they stole it the next day because you're uncomfortable that some of the ink got used.
On a less serious note: The art is cute, i can already tell theyre gonna fall in love.