The Playboy's Game [Yandere Male x (O.C.!) Reader] (UPDATING)

(Y/n) (L/n) is a first year student who wants a quick and uneventful time in high school; however, she is quickly wrapped up in the mess of third-year student Satoshi Ryuu who is known for being a perfect upstanding student.
Between dealing with his fangirls and holding a façade to the public, Ryuu is actually a sociopathic male who likes to create dismay to the women he's been with. Using blackmail and other sources to get what he wants since he does not care for the feelings of others. So, when he was offered a shiny new first year toy who found out his secret he decided on a new form of entertainment. A bet was formed between the two, if Ryuu was able to get (Y/n) to fall in love with him in a month then he will win the game and use her as he pleases; however, if she were to win the bet and not fall in love, then (Y/n) will be able to live her first year in peace.
The game continues in that month and after getting to know (Y/n), Ryuu is starting to dread the end of the month.
Was he falling in love?
Did the game he made to entertain him really backfire?
And when the month is up, will Ryuu actually let her leave him?