Zenmaijikake no Tina

Tina spends her days having fun on Zenmai Island with her friends, including Princess Frog, Pumpu, and Shama. One afternoon, they find an unconscious boy near the "Once Upon A Time Waterfall." Unlike the island's residents, he lacks the key on his back that requires winding. He has no memory of his past, and Tina feels a connection because she also feels lonely. She befriends him, and his presence disrupts the island's usual way of life, where winding keys is a way of expressing affection. The second volume includes the one-shot story "Koisuru Kokoro."