Dinosaur Sanctuary

Story

Dinosaurs are alive! In 1946, a remote island was discovered where dinosaurs never went extinct. Through breeding and genetic manipulation, dinosaur populations increased and dino-mania reached a fever pitch worldwide…until a certain terrible incident occurred. Afterward, dinosaur reserves like Enoshima Dinoland fell on hard times. Enter Suma Suzume, a kindhearted rookie dino-keeper! Can she be the one to save Dinoland from extinction?

Synopsis via AniList (English).