Japanese water balloons

They come on a rubber string and have a bit of water in them so they can go up and down (hence the yo-yo).

裸で甘酒をぶっかける!埼玉県秩父市の奇祭「甘酒祭り」って

裸で甘酒をぶっかける!埼玉県秩父市の奇祭「甘酒祭り」って

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