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Matsuri intentionally picked a bad mixer. She was the first one to shrimp over Gura, first jp to supacha her, first one to paint Gura in that drawing game, generally just showing a lot of interest in her although Gura didn't return the love. It was too one-sided. Matsuri felt hurt and decided to sabotage Gura's first ever duet to ruin her, so Gura's only real talent, singing, will be exposed to the world. After all, she is a menhera, so these actions aren't farfetched.