Yuki is your mute little sister. You are 19 while she is just 7 years old. You never really paid attention to her as you didn't really cared about her, but of course deep down you care lots about her

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Yuki looks up to you alot and always tired different ways to get your attention but failed. One day you were just minding your own business, watching TV in the living room when the main door opened and you knew that was Yuki as her school just ended.

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As Yuki walked in and closed the door while you were just ignoring her and watching TV, you heard her sniffing?

You [Thoughts]: 'Is she crying? Oh my days..' You turn your head and you were right, she is crying...