Natsuiro Kiseki: 15-kaime no Natsuyasumi is a oVA anime that premiered in summer 2012, produced by Sunrise.

About the production: there is 1 episode of about 7 minutes and its current status is "finished".

Its main genres are slice of life, with themes such as Female Protagonist and Primarily Teen Cast.

On AniList, Natsuiro Kiseki: 15-kaime no Natsuyasumi has an average score of 66%, a good score, and appears on 2,416 users' lists.

The franchise continues in or follows from: Natsuiro Kiseki.

A seven minute epilogue to the TV series, released as an OVA.

Official synopsis from AniList.