Our Little Sister
海街diary (original)
Starring Haruka Ayase, Masami Nagasawa, Kaho, Suzu Hirose, Ryo Kase, Ryohei Suzuki, Ikeda Takafumi, Kentaro Sakaguchi, Oshiro Maeda, Midoriko Kimura
It's a drama and family movie, and has a rating of 7.5 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Finland.