In the anime Ainechan doesnt show up until halfway through the series Lambdaucifer has gone through a lot to become a popular band when Sakuya finally meets Aine after almost running her over with his motorcycle. Aines personality is still shy but she is not nearly as spineless as she seems in the manga. Aine is a very lonely girl. Her parents are never home and when they are they argue a lot and ignore her. At school she has a boyfriend but he is rude to her and is just using her to do his homework for him. She does have two girls who are friends but they are so carefree and bandcrazy that she doesnt feel much of a connection with them. To fill her loneliness Ainechan writes a song that she puts her emotions into. After meeting Sakuya she leaves her lyrics behind by mistake. He finds them and becomes interested in Aine. Once she is recruited as Lambdaucifers songwriter she works hard to write music for them. Her relationship with Sakuya builds MUCH more slowly.