It should be something like a prequel for Un poison violent (2010) viewtopic.php?f=13&t=7055 made by the same director, Katell Quillévéré. One of the few reviews available says that it's even better than the future feature film, but sadly, no more info could be found...
https://www.imdb.com/title/tt1647453/https://www.rarefilmfinder.com/movie.php?id=66105
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