Shione has a crush on Takuma, and most likely they used to/do go out together. However recently he hasn't been paying any attention to her so she decides to hit on Ayumu in order to make Takuma jealous. She also dislikes Miki.  [martino's note: her last name might be "Umino", not sure on this one]

Aizawa Ayumu is a young boy, who is sent to a small town called Tana to live with his father for a while. Even though he doesn't want to go, he agrees to do so when his mother offers him a mountain bike. Ayumu used to live in Tana before, and now his memories of the time are shrouded in mystery - apparently something happened when he was a child. Enter Miku, a young girl who knows more than she tells, weird glowing lights floating around, reflections of UFOish objects in the eyes of cats and dogs, a nosy female announcer, a forest with a mysterious past, and a weird boy called Wakkun, who wears the clothes Ayumu used to when he was a child, and you get the world of Zettai Shonen, where mysteries remain mysteries amidst a slow, normal, everyday life.
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(Source: Anime News Network)

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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

Shione Unno