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Cover despite being a software company has one of the weaker live2d apps. That's because Cover isn't just a live2d app. It's also a /u/ hypno device designed to turn the girls increasingly attracted to the same sex. Matsuri's menhera was the result of a fuck up by Cover, when one of the prototype devices was too powerful making her completely obsessed with Hoshikawa. Since then, Cover has been focused on improving it's tee-tee effect that comes from slow but prolonged exposure in order to monitor the girls' mental state to better control the girls' homolust levels. This is why the girls who displayed heterosexual tendencies at the start of their careers becomes increasingly tee-tee and attracted to girls over time.