Ultraman: Let the Game Begin

Heaven and earth are the board, all things are the pieces. Who is a piece, and what is the game? How can any of us be sure we're not part of it... Synopsis: On the eve of the college entrance exam, 17-year-old high school student An dies suddenly after staying up too late. A naive little System captures him and sends him to the Ultraman universe, where he becomes the ultra-intelligent alien life-form Celebro. From then on, he plays games of civilizational destruction in one small world after another, throwing one obstacle after another in the path of our champions of justice, the Ultra Warriors... An: The five of us were abandoned by fate. I thought they were just pieces in this game. So why do I feel warmth when I'm with them... ...: Big brother, this time I won't let you “run away” again. Shi: That great one brought color to my gray skies. Yuan: I gave her my whole heart, and she deceived me. In the end, that great one was the one who saved me. Ling: What is justice? Only that great one is truly just. Hao: Since you took me in, big brother, you're mine now. Please note: ① This story has two male leads, but they won't be “out in the open” early on. After all, making it too obvious would spoil the story. ② The protagonist had a tragic past life, which left him with an unusual personality, most notably that he isn't a self-sacrificing saint. He's in another world to have fun, not to save the world or play the saint. ③ Some of the monsters in this story are original creations, and the plot will deviate from the original. In particular, there is no distinction between good and evil, or light and darkness. Might makes right. If that's not your cup of tea, please move along. Finally, please don't conflate the novel with reality.