I’m in an Anime Crossover, Reborn as a God of War

(No Game No Life, Attack on Titan, Rent-A-Girlfriend, Jujutsu Kaisen, Bocchi the Rock!, Lycoris Recoil...?) After transmigrating into a crossover world, he becomes an abandoned child of the Zenin Clan. Zenin Yuu thought he would spend this life going nowhere, only to be killed by a powerful curse. Unexpectedly, he awakens a stat-boosting System and memories of the God of War, the strongest of the Heavenly Spirit Species. So what if the strongest in the Jujutsu Society is WTW, or Sukuna stands alone above heaven and earth? In the face of the very concept of the strongest, everything else is meaningless. (The author writes multiple heroines. If you only like one heroine, this isn't for you. And if a character you like gets left out, feel free to curse the author out!) (Also, the author doesn't like following the original plot. The story goes where the author's own ideas take it, so readers hoping the protagonist will join the original story may be disappointed.)