女高中生鹿角华莲，因为幼年时期记忆的碎片突然从脑海中闪过，意识也随之消失，因这种奇特的记忆丧失症状而烦恼着。 一次，为了修学旅行而拿到申请护照用的户籍誊本的华莲，意外知道了自己被收养的事…

Karen is an ordinary high school student in Tokyo, but she sometimes recalls pieces of her childhood memories that she did not know before. During the process of getting her passport for a school trip, Karen views her family register. She learns that she had an older sister Yukari, who died at the age of 4. Karen also learns that her parents are not her biological parents and that she was adopted. Karen now wants to learn about herself. She lies to her parents and tells them that she is leaving on the school trip. Instead, she travels to Fukuoka where she was born. Her classmate Satoi Hogari accompanies her.