The Case of Hana & Alice is an animated prequel to his live-action 2004 coming-of-age film Hana & Alice. The original film showed the friendship between two high school girls; the anime film explains how they first met.
The animated film is summarised on the website as follows:
Alice is off to a fresh start. Having just settled down with her recently divorced mother, she's set to begin school at a new college. Upon arrival, she quickly falls victim to bullying, but after running into Fuko, an old ballet partner, she finds solace in returning to dance. It is during such a dancing session that she overhears about the enigmatic affair of the Ishinomori High murder. When Alice discovers that her next-door neighbour Hana, who's been holed up inside her apartment for months, holds the missing pieces to an unsolved murder, she decides to pay her a visit.Iwai directed The Case of Hana & Alice, wrote the screenplay and composed the soundtrack. The Japanese-language trailer is below.