Three years have passed since Yu entered a boarding school when his father remarried. His fruitful student life came to an end, and his graduation ceremony came. On his way home with a friend, his stepmother Yuna came running up to him from across the street, smiling. The two are happy to see each other again after a long time, and celebrate their graduation... Yuu drinks too much in joy, so he takes care of her. Yuu left home to shake off his feelings for the girl he had admired, but he can't suppress the feelings that welled up inside him again... And so he takes another step towards adulthood.