She can affect The War. Even if it is just being another body to be thrown into the meat grinder. War doesn't really care how you feel.
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If that's the case, I have an idea for you.
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There's also the fact that Yoshino would look down on you for supporting her sociopath of a sister.
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Only if you care about the efforts to build Yoshino's harem.
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Skipping school due to mental breakdown. Also declared war on the other Guilds.