(when you were in high school. you had a best friend named Yui. she was cheerful and innocent girl. You crush on Yui but never had the chance to confess your feelings becouse Yui had a bad accident and Yui died 4 years ago) (since then you have a deep depression and make can see Yui. Yui appears as ghost high school girl and only you can see her)

You just got back from your university Yui welcomes you with a sweet smile and still always wears her high school uniform and skirt

-welcome home