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  • Award Snub: Or rather, Nomination Snub. After a limited theatrical release, FUNimation attempted to submit Summer Wars for an Academy Award, but, due to the fact that there were less than 16 entries submitted that year, only three nominations were allowed instead of five as the Academy policy dictates, and Summer Wars was not chosen.
  • Breakout Character: See Ensemble Darkhorse.
  • Complete Monster: Love Machine doesn't seem like this at first; in fact it's theorized that he only sees what he's doing as a game. Then he tries to drop a satellite on the house purely out of spite.
  • Crack Pairing: The pairing of Riichi (the uncle in the Self Defense Force) and Wabisuke grew immensely popular on Pixiv and elsewhere despite the fact that the two are never shown directly interacting with each other.
  • Crowning Music of Awesome: Battle Again, which plays during King Kazma's rematch with Love Machine and during Natsuki's Hanafuda card game with Love Machine.
    • The ending song by Tatsuro Yamashita is touching and happy at the same time
  • Ensemble Darkhorse: Kazuma, along with his avatar King Kazma, has quite a lot of fanart.
    • Enough to get a spin off manga apparently.
    • Another example being the series's resident Badass Grandma Sakae, who was so awesome that her eventual death was felt by both the Jinnouchi clan, but also anyone and everyone who watched the film.
  • Hilarious in Hindsight: The climax of the movie prominently features a Japanese asteroid sample-return probe being hijacked by Love Machine and set on a re-entry profile that will destroy a nuclear power plant. The Japan Aerospace Exploration Agency's Hayabusa mission was a similar asteroid sample return probe which did return to Earth in the summer of 2010, and which did experience failures leading to a barely-controlled crash-landing in Australia.
  • Memetic Sex God: Everyone's a gay furry for King Kazuma.
  • Tear Jerker:
    • Sakae's death. Also, Sakae's will being read to the family, where she pleads to them to take Wabisuke back into their lives.

  "I want all of you to sit together and eat as a family. As you have always done. The worst things in this world are being hungry and being alone."

    • The manga adaptation makes Sakae's death worse when Kenji has a nightmare where he's alone in a dark, destroyed OZ, the bodies of defeated avatars all around him (King Kazma included) and finds Sakae attempting to face down Love Machine all on her own with the same weapon she'd pointed at Wabisuke. Cue Kenji jerking awake only to realize something's wrong.
    • Seeing the sardonic and to this point quite unlikeable Wabisuke have a BSOD once he finds out Granny Sakae just died. After rushing back to the house (and by the look of the car, going through anything in his path), he cries out for Granny with such a look of despair on his face it breaks hearts.
    • In a similar vein, seeing reclusive and sharp-tongued Kazuma break down completely after Love Machine defeats him a second time and devours King Kazma. He breaks down crying not only because he lost--and to him that's kind of a big deal, since many users know him as a world-renowned fighting champion--but also because he feels that he couldn't protect his mother and unborn sister from the incoming threat.
    • This Troper, oddly, tears up during the Casino scene, where all the people around the world donate their accounts so Natsuki can keep fighting.
  • Viewer Gender Confusion: Kazuma's character design and voice are so feminine that many an audience mistook him for a young girl when he first appeared.
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