Read The Body Game hentai manga on hentaidexy.
summary for The Body Game :
Back on campus after his military service, Jang Daechu can’t wait to get some action. However, a series of untimely events leaves him knee-deep in debt and with a tarnished reputation. All hope seems lost, but one day, he receives an invitation to the “Body Game.” The rules look simple: hide a number on your body, then find the numbers of three other participants. How? By having as much sex as you can! With 30 million won on the line, will this raunchy game help Daechu get back on his feet?