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If you have the Webt@@n app, change the content language to French, you'll find the series on French Webt@@n. Subscribe to it, and like all the episodes, you can even leave comments, this way you're supporting the creator and they might be able to finish the story.
I already disliked this author's other manga where one of the love interests was the girl's teacher, but in this series a man in his late 20s is romantically involved with a high schooler.. This is just wrong on so many levels, she could have been a college student at least