Onee-chan no Midori-kun Live-Action Film Reveals Main Trailer

The live-action film adaptation of Amu Meguro’s Onee-chan no Midori-kun has unveiled its main trailer and individual character posters ahead of its December 4 opening in Japan. The preview features “Honto no Koto wo Iuto,” the theme song performed by the idol group timelesz. Group member Masaki Hashimoto stars as Midori Yukishiro in his first leading film role, alongside Runa Nakashima, Rinka Kumada and Leo Matsumoto. Directed by Mahito Kimura and written by Nami Yoshikawa, the story follows Sui, a student initially irritated by her older sister’s boyfriend, Midori. As they study together, she discovers his kindness and develops unexpected feelings. The source manga runs in Bessatsu Margaret and has reached eleven collected Japanese volumes.

CrunchyRoll, Mikikazu Komatsu – Onee-chan no Midori-kun Live-Action Film Releases Main Trailer, Character Posters – 22nd October 2026