It's a Summer Film!

It's a Summer Film! is a 2020 Japanese action-comedy film about a high school student named Barefoot (Marika Ito) and her friends who decide to make a samurai movie called Samurai Spring for their school festival. Along the way, they team up with Rintaro (Daichi Kaneko), a mysterious boy who claims to be a time-traveling fan of Barefoot's future films, leading to unexpected twists and turns in the film's production and its meaning.