Hotarubi no Mori e  A 44-minute anime film with the same title was produced in 2011 at the anime studio Brain's Base and directed by Takahiro Omori. The film starred Japanese voice actors Ayane Sakura and Kōki Uchiyama, and its soundtrack included music by Makoto Yoshimori. The film maintained a strong following for months in Japan after its opening on . The European premiere of "Hotarubi no Mori e" was on at the Scotland Loves Animation festival, where it won the Jury Prize. It was screened at the Leeds International Film Festival, Anime Contents Expo and Anime Expo convention, and also won the Animation Film Award at the 66th Annual Mainichi Film Awards. The anime was released on Blu-ray Disc (BD) and DVD in Japan on . An additional story related to the original manga and anime film, titled , was released in a keepsake edition of the manga 12 days prior to the release of the anime. Both the keepsake edition manga and the limited edition BD ranked No. 13 on Japan's Oricon sales chart shortly after their release. Sakura reported experiencing a strong emotional reaction to the story while recording the voice of Hotaru, and Midorikawa acknowledged that the story had a positive impact on her career. Reviewers universally praised the anime film for its beauty, simplicity, and tenderness, likening it to the works of Hayao Miyazaki of Studio Ghibli and Makoto Shinkai. There were few criticisms, most commonly focusing on its short length. The original "Hotarubi no Mori e" "shōjo" manga and subsequent film tell the story of a six-year-old girl named Hotaru Takegawa, who gets lost in a forest inhabited by a "yamagami", or mountain spirit, as well as "yōkai" (strange apparitions from Japanese folklore). She is found by a mask-wearing, human-like entity named Gin, who informs Hotaru that he will disappear forever if he is touched by a human. Gin then leads Hotaru out of the forest. Hotaru returns to visit Gin in the forest over the next few days and they become friends despite the limitations on their interactions. Although at summer's end she must leave Gin to return to the city and her studies, Hotaru promises to return to visit him every summer holiday. As the years go by, Gin hardly ages while Hotaru physically matures and grows closer to his apparent age.