Kogechibi lives in the library, and looks like a four-inch (102 mm) -tall Eve, though with different colored eyes. &quot;Koge&quot; refers to the one-eyed cloak that covers all of her but the eyes. In the game, when the main character is occupying &quot;Koge&quot;, the girl is referred to as &quot;O-chibi-chan&quot; (&quot;o&quot; being an honorific and &quot;chan&quot; an endearment). Kogechibi&#039;s vocabulary is composed of unintellible sounds akin to baby talk. In the anime, she has a disturbing love of fireworks and can say a few words if they have something to do with explosives; she builds miniature catapults and launch platforms, and fills hollow fountain pens with gunpowder and uses them as bottle rockets. She plays a small part in the plot, but is mostly comic relief in the anime. In the game, it is revealed that the guardians &quot;fragment&quot; when they overexert themselves, and that the fragments take on a life of their own. Kogechibi is a fragment of Eve.   

Hatsuki is a highschool student living with her sister, Hatsumi, who she has a huge crush on. On Hatsumi's 16th birthday, she is suddenly surrounded by a green light and disappears in front of Hatsuki. She manages to follow Hatsumi with the help of a being resembling a fat baby chick (literally), ending up in a place called "The Great Library", which is full of different worlds stored in books. Hatsumi wasn't there, though, so the search for Hatsuki's great love begins and involves traveling from book to book.

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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