Amanju is the eleventh Cardian that Ail sent to gather energy for the Maikiju. She was the most insane of all the Cardians and refused to obey Ail's commands and the only one to do so. She appeared in episode 11 of Sailor Moon R.
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When An began to lose energy, Ail sent Amanju to drain energy from Mamoru for her, but she refused to listen to him and jumped on his head. Without attacking Mamoru at all, Amanju attacked a cram school that Ami attended and drained energy from students there. She also came to steal energy from Haruna Sakurada and her date, and was scolded by Ail for her disobedience. Instead of attacking Haruna and her date, Amanju drained energy from ducks. The Sailor Senshi (minus Sailor Moon, who was in detention with An) attacked her but she gained the advantage. Usagi transformed into Sailor Moon to fight Amanju, but was unable to use Moon Princess Halation against her, as An had drained some of her energy. When the Moonlight Knight told her to believe she had the energy to defeat Amanju, Sailor Moon destroyed her with her scepter.