I can't remember the title of this manga that may be about a survival game. I don't remember if the stakes of this game involve life and death or something else. What I remember is the strange requirement to participate in this game. One female character receives a mysterious message on her phone that tells her to send a nude photo of herself if she wants to participate in this game and she reluctantly does so. I remember this manga is non-H and no private parts are shown, they're either blocked by a light beam or conveniently censored by something else.