No, because it's not manga-related. In fact, if you changed the title to say "mangaplot ideas", it still wouldn't be allowed, because this isn't a writing subreddit. Take it over to /r/mangamakers or /r/writing.

RULES

Posting Original Series

Original manga-inspired series are a grey zone in terms of the rules. All original series should come in the form of self/text-posts and should be clearly identifiable as manga-inspired. (...) Text drafts/character designs by themselves are not allowed. If you're going to submit your "original manga," don't just post a character design or a single page of text. If you want feedback/advice on your synopsis of your original series, please bring it to /r/writing.