White trees blossom and the sky glows with turquoise; memories float in a singing wind. This is the White Forest where Oowa and his friends live, abundant with treasures of life waiting to be discovered. They trade their pleasant memories for the things they need. But what Oowa definitely needs most is a smile. A journey through the White Tunnel to all the joys and pains of memory is the only way Oowa might gather enough good memories to smile again. However, just as the journey begins, he discovers something unexpected about yesterday and tomorrow.