The twin sister to Junna. Because their parents died in a car crash, She and Junna live together in a house. Senna and Junna support and rely on each other and due to this Senna is very fond of her Onii-chan. However, Senna&#039;s existence is doubted as she does not exist in the real world, only in a world which she and Junna had created by their wish, they both wished that Senna will exist, thus, creating a world where she existed. Sadly, a compensation is required to make up for the wish, so their parents had cease to exist in the created world as well as Haruhi, who was her sister, had became Junna&#039;s childhood friend instead. She was supposed to be Junna&#039;s twin sister in the real world too, but she was not born, which is the reason she did not exist in the original world to make the wish.

Based on a game by Princess Soft 
The main character, Junna has a twin sister Senna. He is an ordinal student of an elite school. However, in the past, a traffic accident deprived him of his parents and his memory. Junna survived the accident, and he has lived only with his sister though he has been looked after by his relatives. 
And present... 
The life with Senna in the same high school is so pleasant that he can forget the severe past. Because he has been in the world where there is only Senna, his lives in this town, such as the beginning of a new life, new environments, and the meetings, are so refreshing. 
However, he begins to recall the memories he lost in the accident. Though he enjoys happy and pleasant days, he is tossed by the past, the present, and the future. What is the truth hidden in his memory? 
(Source: AniDB)

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Ai Shimizu is a Japanese voice actress and professional wrestler. She has a career as a singer, signed to Lantis. She has released 14 singles (including joint and character singles) and four albums. She covered Yumi Matsutoya's "Toki o Kakeru Shōjo" as the B-side of her first single "Angel Fish" in 2003. She is known to have a close relationship with Mai Nakahara, having collaborated in eight anime where most of the characters they voiced in together had close connections: DearS, Kage Kara Mamoru!, My-HiME, My-Otome, My-Otome Zwei, Please Twins!, Sola, Strawberry Panic! and the Lucky Star drama CD. Shimizu has worked sporadic professional wrestling matches since December 2013

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