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The Blue Star of the future was impacted by mysterious energy. Not only did the entire planet expand several times, but also creatures called monsters appeared. Many years later, humans developed a way to gain power by traveling to other worlds. And our protagonist traveled back in time with his memories and started his own adventure. This book does not have a harem and there is a heroine. You can guess who it is. My writing is really good *please take care of me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.