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Yuki Sohma , aged 16–18, is the rat of the Chinese zodiac and younger brother of Ayame. Yuki is depicted as an attractive, reserved, and accomplished young man with many admirers, but who finds being friendly difficult. When Yuki was young, his mother gave control of him to Akito Sohma, who kept him separated from the rest of the zodiac and convinced him no one liked him; because of this, Yuki has low self-esteem and feels isolated.

Source from Wikipeida