Mirai of the Future

Kun is a happy four-year-old boy until the birth of his little sister Mirai. His joy quickly turns to disappointment when she replaces him as the center of attention. But Kun discovers a mysterious garden: a magical door to a fantastic world where past and future meet. There, he will encounter his family members at different stages of their lives, including his baby sister as a teenager. These experiences change his vision of the world and help him grow into the big brother he was meant to be.