Music video for the song Otogibanashi no Youna Kiseki by Aoi Kubo. 
The music video features the anime's two main characters, Maise Higa and Ichirou Suzuki, and depicts their emotions and past stories before they met, such as why Maise decided to spend her summer vacation working part-time at a hotel and why Suzuki came to Okinawa. 

(Source: Crunchyroll) 
Note: The song featured in this music video was also used as the ending theme for the anime Deji Meets Girl.

Miracle