Transmigrating a Thousand Years for Day and Night

Quick transmigration! An ordinary middle school girl goes through bizarre, fantastical transmigrations every night, only to open her eyes in the modern world and find that just one night has passed. But who can say for sure that those crystal-clear experiences didn't happen in the real world? An ancient, mysterious underground city, the warring factions of eighteenth-century Europe, strange and wondrous coastlines, and more. Every morning, her aching body and exhausted mind seem to tell her that this is no ordinary dream!

After weathering countless trials and looking back, she realizes that everything happened for the sake of a promise...