Children of the Whales
クジラの子らは砂上に歌う (original)
As a magic wielder, young archivist Chakuro knows his time is short, but everything changes when a girl from the outside appears on his island.
Starring Natsuki Hanae, Mikako Komatsu, Nobunaga Shimazaki, Daiki Yamashita, Hiroshi Kamiya, Manaka Iwami, Yuuichirou Umehara
Watch "Children of the Whales" on Netflix released in 2017. It's a animation and drama show, and has a rating of 7 out of 10 from Imdb which is usually fine for this kind of show.