Reunion with my younger sister Mika. Since I came to Tokyo, I have hardly been back to my parents' house, so my younger sister Mika came to visit me. I wonder how long it has been since we last saw each other... When I met Mika again after a long time, she seemed the same, but also like she had changed completely. When I sensed the subtle change from a girl to an adult in her expression and behavior, something inside me exploded...