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Plumstars (梅星 Umeboshi) is a Space Ingredient.
It is a sour "star" that rarely descends from the outer space.
It comes down at speeds of 923 kilometers per second (almost 3000x the speed of sound), and can create crater with as much as 50 meters across.
- Its name in kanji is a portmanteau of "Umeboshi" and "Hoshi".
- It was created by Sugimori Yuusei (杉森悠生) of Tokyo prefecture.