My Girlfriend Disappears at the Beginning: You Call This a Game?

[System + copy + reversal + single female + non-rebirth + slightly brain-burning + level-breaking] Someone suddenly died mysteriously on the street, and his girlfriend mysteriously disappeared during a date, leaving only a series of incomprehensible numbers... In order to find the so-called truth, he was forced to get involved in the game and must rescue his girlfriend! However, he did not know that this was a fatal "feast"