The official website for My Sister’s Boyfriend, the live-action film of Amu Meguro‘s Midori Loves My Sister (Onē-chan no Midori-kun or literally My sister’s Midori-kun) manga, presented a new 60-second trailer and character posters for the film on Thursday. The trailer announces and previews the film’s theme song “Hontō no Koto o Iu to” (If I Tell the Truth) by the group timelesz.
Image via Onē-chan no Midori-kun live-action film’s X/Twitter account
©2026「お姉ちゃんの翠くん」製作委員会 ©目黒あむ／集英社
Image via Onē-chan no Midori-kun live-action film’s X/Twitter account
©2026「お姉ちゃんの翠くん」製作委員会 ©目黒あむ／集英社
Image via Onē-chan no Midori-kun live-action film’s X/Twitter account
©2026「お姉ちゃんの翠くん」製作委員会 ©目黒あむ／集英社
Image via Onē-chan no Midori-kun live-action film’s X/Twitter account
©2026「お姉ちゃんの翠くん」製作委員会 ©目黒あむ／集英社
Image via Onē-chan no Midori-kun live-action film’s X/Twitter account
©2026「お姉ちゃんの翠くん」製作委員会 ©目黒あむ／集英社
The original manga centers on Sui, a girl in her third year of junior high. She doesn’t really get along with her older sister’s boyfriend, Midori-kun, since he always treats her like a kid and makes fun of her. But Midori-kun is suddenly asked to be Sui’s home tutor, and she suddenly sees an unexpected side of him.
The film has the English title My Sister’s Boyfriend, and stars timelesz idol group member Masaki Hashimoto (live-action Summer Complicity) as Midori Yukishiro, and actress Runa Nakajima (live-action Uchi no Otōto-domo ga Sumimasen) as Sui Sanae. Rinka Kumada (live-action Otonanajimi, Kimi ni Todoke, It Takes More than a Pretty Face to Fall in Love) plays Sui’s older sister and Midori’s girlfriend Momo Sanae, and Reo Matsumoto (live-action I Cannot Reach You, Propaganda Game) plays Sui’s childhood friend Ayame Mizukawa. Taisuke Niihara (live-action At 25:00 in Akasaka, Young & Fine) plays Amamiya, a new assistant producer at the same TV station where Sui’s older sister Momo works.
Mahito Kimura (live-action Strobe Edge, Blue Spring Ride series) is directing the film, and Nami Kikkawa (live-action Honey Lemon Soda film) wrote the script. Shochiku is credited for planning and overseeing the production, and is also distributing the film.
The film will open in Japan on December 4.
Meguro launched the manga in Shueisha‘s Bessatsu Margaret magazine in 2022. Shueisha published the manga’s 11th compiled book volume on April 23.
Meguro ended the Hinata no Blue manga in July 2021. Meguro launched the manga in Bessatsu Margaret in April 2019.
Meguro’s Honey So Sweet manga ran in Bessatsu Margaret from August 2012 to November 2015. Viz Media‘s Shojo Beat imprint has released the eight-volume manga in English. The series was ranked as one of Japanese Bookstore Employees’ top recommended comics for 2014. The manga inspired a live-action film adaptation that opened in Japan in March 2018.
Sources: Onē-chan no Midori-kun live-action film’s website, Comic Natalie