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An otaku girl named Mili was reborn and came to her favorite world - the age of great pirates. She understands what has not yet happened to Luffy, the young man who wants to become the Pirate King. She wants to help him quietly and accompany him on his journey to become the Pirate King... Unfortunately, Meili brings its own source of danger. The road to the Pirate King becomes more and more crooked. Whether she can accompany Luffy to the top in the end has become an unsolved mystery in the world.

A genius girl lost her parents unexpectedly and embarked on a journey of exploration in order to find the truth. There were many dangers along the way, and the gradual death of friends and relatives caused her painful amnesia, but she found a bad fate...