Nijiiro Hotaru: Eien no Natsuyasumi is an anime film that premiered in spring 2012.

About the production: the story comes from a other, the film runs about 105 minutes and its current status is "finished".

Its main genres are fantasy, romance and slice of life, with themes such as Rural and Time Manipulation.

On AniList, Nijiiro Hotaru: Eien no Natsuyasumi has an average score of 68%, a good score, and appears on 3,511 users' lists.

Yuuta was 12-year-old boy, who had lost his father in the traffic accident one year ago. In the summer vacation, he visited a deserted dam deep in the mountains, where he had a good time with his father before. Suddenly a thunder storm occurred and he slipped on the ground. He lost consciousness and woke up to find a girl and an unfamiliar village. He time-traveled 30 years and reached a village, which sank at the bottom of the dam. This is Yuuta's precious memory of "another" summer vacation.

Official synopsis from AniList.