Haikara-san: Here Comes Miss Modern Part 1
劇場版 はいからさんが通る 前編 ~紅緒、花の17歳~ (original)
Starring Saori Hayami, Unsho Ishizuka, Shizuka Itoh, Yuki Kaji, Kenta Miyake, Mamoru Miyano, Kazuya Nakai, Takahiro Sakurai
It's a animation and comedy movie, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Argentina.