Three years after his father remarried and he entered a boarding school, Yu’s fulfilling school life ends with graduation. On the way home with friends, he sees his stepmother Yuna running toward him with a smile. Delighted to reunite after so long, they celebrate his graduation together. When Yuna drinks too much, Yu takes care of her. He had left home to bury his feelings for the woman he admired, but now those emotions surge back beyond control. In this adult role-play, her intimate graduation gift leads him another step into adulthood...