How to Build a Secret Base Trailer (2025)

01 August 2025 Drama 109 mins

When 50-year-old Kenichi and his childhood friends reunite at the funeral of their classmate, they decide to bring a long-forgotten dream back to life—the "secret base construction plan" they'd drawn up as kids. They have just six days that summer to build their hideout without cars, electric tools or smartphones. Rediscovering the spirit of their youth, the men throw themselves into the challenge with all their hearts. Still, they are unable to escape the struggles they face as adults.

Watch the official How to Build a Secret Base 2025 trailer in HD below.

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Cast

Hiromasa Hirosue

Takehiko Fujita

Kozo Sato

Crew

Tomoya Itabashi Director

International Releases Dates

Italy 07 October 2025

Japan 22 July 2025

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