Summer Wars (2009)

Teenage math whiz Kenji Koiso agrees to take a summer job at the Nagano hometown of his crush, Natsuki. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of their matriarch. His job: pretend to be Natsuki's fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world's collision with Earth.

Genres: Animation, Science Fiction

What to watch after Summer Wars

• The Girl Who Leapt Through Time (2006) — Mamoru Hosoda directed both
• Weathering with You (2019) — Two steps away in the credits
• Paprika (2006) — Same subject: adult animation
• Mirai (2018) — Mamoru Hosoda directed both
• Children's Party (2011)
• Summer Storm (2004) — Same subject: holiday