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Well I guess it isn't a love rival for either of them, kind of... I guess knowing that Hikaru (mixed breed dude) is now gonna try and capture her might count. Anyways sucks that Usagi now has to fear her sister-in-law like that, although if she quite being a shinobi not sure why she still gives a shit about the situation of who he marries in terms of how it will help or harm the village.