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Yui is also the head of the Chinese mafia group, Char Siu (Chinese: 叉燒, Chāshāo). Yui is also in possession of a fourth key but has confirmed to Raku that she is not the girl he had made a promise with ten years prior.

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She serves as the fake girlfriend of Raku Ichijou for the next three years of her school life to prevent a war from starting between their families. She is Raku's love interest.

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She is Kosaki Onodera's best friend and is one of the few people who knows about Onodera's feelings for Ichijou. She constantly tries to help Kosaki admit her feelings for Raku. Ruri soon found her own love in Shuu and confessed her feelings to him near the end of the manga. They became a couple and... read more

She is Kosaki Onodera's best friend and is one of the few people who knows about Onodera's feelings for Ichijou. She constantly tries to help Kosaki admit her feelings for Raku. Ruri soon found her own love in Shuu and confessed her feelings to him near the end of the manga. They became a couple and are seen living together in the final chapter.

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Raku Ichijō's former love interest.

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Tsugumi is originally introduced as a male student who transfers to Chitoge's class and has orders to protect her from Raku, whom she thinks he forced Chitoge into having a relationship with him.