- Movie: Teen Bride (English title) / That Is Not a Child But a Minor (literal title)
- Romaji: Miseinen Dakedo Kodomo Janai
- Japanese: 未成年だけどコドモじゃない
- Director: Tsutomu Hanabusa
- Writer: Kanan Minami (manga), Keiko Hokimoto
- Producer: Yoshihiro Sato, Chiaki Baba
- Cinematographer: Kosuke Yamada
- Release Date: December 23, 2017
- Runtime: 105 min.
- Genre: Based on a Comic / Teen / Marriage
- Distributor: Toho
- Language: Japanese
- Country: Japan
On Karin Oriyama’s (Yuna Taira) 16th birthday, she receives a present from her parents. Her present is marriage. The person she marries is her first love Nao Tsurugi (Kento Nakajima). He is a popular senior in high school. For Nao, he only marries Karin for economic reasons and in particular the wealth of her parents. Karin loves him truly, but Nao doesn't love her at all.
Their marriage is a secret, but Isuzu Ebina (Yuri Chinen), who holds feelings for Karin, learns of their marriage.
- Based on manga series "Miseinen Dakedo Kodomo Janai" by Kanan Minami (published from December 5, 2012 to February 5, 2016 in shojo manga magazine Shojo Comic).
- Filming takes place between August and September, 2017 around suburbs of Tokyo and Toho studio.