Arisa is cosplaying as Misha from Pita-Ten.
This cute and perky angel is Kotarou's new next-door neighbor and her main passion in life is stalking and glomping Kotarou. She's an apprentice angel (anime) or unofficial angel (manga) who speaks like a small child and tries to make everybody around her happy; consequentially making matters worse. She is very hyper and outgoing around Kotarou. She is happy and optimistic, and has always managed to keep on smiling. She becomes best friends with Shia when Shia moves into her home. As a young angel, Misha befriended Kotarou, Kotarou's granduncle. However, when she was told to return to Heaven, Kotarou (the first) committed suicide. Misha was blamed for the incident and punished, being forced to wear black and kept trapped in a thorn cage. During her time on earth, her exam to become a fully licensed angel is to make Kotarou happy (manga only).