Toaru: Level 0 with a Mythical System

Academy City. Science. Magic. And one broken System. ​Waking up in Academy City with the Treasure Chest System, Takahashi Yuuya hits the jackpot immediately: The Unique-Rank Star Grail. ​With the ultimate cheat in hand, he casts aside his hesitation. Why struggle as a background character when you can rule the stage? ​His presence changes everything. He leaves the strongest Esper, Accelerator, questioning his reality. He sends the leader of God's Right Seat, Fiamma of the Right, running in terror. Even the manipulative Archbishop, Laura Stuart, hides behind closed doors, praying he doesn't turn his gaze toward London. ​Yuuya is the drop of ink in the pure water of this world. And he won't stop until everything is dyed in his color. .... ..... ..... — Description from novelcodex.org