Renai Survival Reality Show ni Kita Hazu ga, Real Survival Death Game wo Ikinuku Koto ni Narimashita

Hoping to find their soulmate, 16 men and women have come to be contestants on "True Love", a survival reality show in which they spend one month living on an unhabited island called "Love Paradise" where its summer year-round. By completing many romance-focused game events, the men and women will be able to form intimate relations with each other, and the couple who makes it all the way through the final event will receive 500 million yen!
However, kissing, having sex, and even masturbating are all off limits during that time! Surveillance cameras have been set up in the hotel where they're staying, as well as all throughout the island... And if they're caught doing any of these forbidden activities, the amount of available prize money will decrease!

Taiyou Tominaga, a rather introverted illustrator, has ended up as a contestant on the show due to certain extenuating circumstances, but the other contestants are also all oddballs with their own reasons for participating.
As their various intentions intertwine on this remote island that's cut off from the outside world, an event no one could have expected takes place, and before they all realize it, "Love Paradise" is transformed into the scene of a high-stakes death game in which they have to fight for their own survival...

Source: anime-planet.com