Rea Amano (天野 礼亜, Amano Rea) is the mother of First Diary Holder Yukiteru Amano and the ex-wife of Kurou Amano. It is later revealed that the reason why she divorced was that his father, Kurou Amano, was pretty bad at handling money and therefore had obtained a huge debt. She is killed in the second world by her desperate ex-husband Kurou Amano because she wanted to take him to the police after she had seen him coming down from the Sakurami Tower with a parachute without Yukiteru.