Twin sister of Rika and a childhood friend of Yuusuke Yamamoto, Yuka made a promise to marry the young boy when they grow up. Much more outgoing and outspoken than her sister, she will use her ample assets to get what she wants without embarassment.

(Source: Anime-Planet)

A strange relationship develops between college-boy Yusuke and the beautiful twins, Yuika and Rika, he saves from a wild dog. The girls falls for their dauntless hero, but Yusuke is pathologically scared of women.
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(Source: Anime News Network)

Yuka Nakamura