[Comprehensive] Who Killed Mary Sue?

Welcome to Monokuma TV! You guys are probably tired of watching the usual drama of high school students killing each other, right? Then, next, is a brand new drama! What despair will the children of fortune, who represent hope, bring to us! It's really exciting, uh-huh-huh-- ———————— Because of the invasion by time travellers, the original world lines of the five worlds collapsed. The lives of the original children of destiny have undergone tremendous changes. Their relatives, partners, and everything they cherished have been destroyed by the invaders. In their despair, they heard the voices of the world. Want to change your destiny? The six contestants who lost their memories and returned to the original were locked in a completely closed castle with a strange girl. The strange voice said to them: "Escape from here and you will find the most important thing." The game of destiny begins. The girl's body appears in the secret room. Who killed her? Who can be the winner in the secret room? —————————————— Disclose player information below Sawada Tsunayoshi 25 The Italian godfather who has all the Guardians seriously injured/dead (Returned to the second grade of junior high school at the age of 14) Kudo Shinichi 24 The genius police chief who decides the case by any means necessary (Returned to the first grade of primary school at the age of 16) Monkey D Luffy 22 Both brothers died, and the fifth sea emperor decisively killed (It has been rolled back to the age of 17 and entered the Grand Line period) Edzak Foster 28 In order to fulfill his wife's wish, he killed her with his own hands, a reliable murderer in red long johns (Back to the unreliable period when I was 20 years old and waiting for Ray in B2) Xiao Meiyan 14? The magical girl who broke the soul gem of her best friend Madoka Shikame with her own hands (Returned to the second grade of junior high school at the age of 14) God's Izuku/Hyuga Sou 22 An artificial god who joins the forces of despair (Returned to the 16-year-old preparatory course period) *1 escape room + scripted killing, Mary Sue was indeed killed by someone among the crowd *2IF line characters will have certain OOC *3 Due to the limitations of the author's IQ, there may be flaws in the plot and secret room design. Intention: The power of guardianship can defeat all illusions.