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Yukiteru Amano (or Yuki) is a loner who never really interact with people and prefers writing a diary on his cell phone with his only companion being an imaginary friend named Deus Ex Machina, the God of Time and Space. However, Yuki soon learns that Deus is not a figment of his imagination but real when Deus makes him a participant in a battle royale with eleven others.

The "Seven Deadly Sins," a group of evil knights who conspired to overthrow the kingdom of Britannia, were said to have been eradicated by the Holy Knights, although some claim that they still live. Ten years later, the Holy Knights have staged a Coup d'état and assassinated the king, becoming the new, tyrannical rulers of the kingdom.

After witnessing the “Little Giant” of Karasuno play in a national championships volleyball match, young Hinata Shoyo instantly gets inspired and decides to revive his school’s volleyball club. Although managing to force some of his friends to join his team and even participate in a tournament against other schools, Hinata’s inexperienced team terribly loses their first game against the prodigal “King of the Court” Tobio Kageyama.