絶体絶命ゲーム (Series) favorite_border

Volume 1 description: A mysterious invitation to a game arrives at Haruma's door. First prize: 100 million yen. The conditions for entry: 1) You must desperately want money. 2) You must be able to stay out overnight without your parents knowing. 3) You must not tell anyone. 4) You must be willing to accept that losers cannot be guaranteed their lives… When Haruma arrives at the venue, he and the other participants find themselves locked in. "I won't lose." "I'm going to win, no matter what." Boy...