Valssu is a Japanese genius of the erotic exhibitionist genre! Thankfully, there are English translations of many of his mangas to enjoy.
In this latest story (166 pages long!), a school girl loses a bet to a childhood friend and is made to strip naked in the park. Of course, a lot of male classmates and strangers happen to drop by. She eventually accepts the dare, wanting her friend to stop her strip or at least admit that he wants to see her naked. To tease her friend, the girl gradually exposes more and more of her body to the other onlookers. Ending is a cliffhanger for the next volume!