Boku to Chourui Hyakkaten

Haru Shirosaki, nine years old, is a 4th-grader who has little thoughts for his future. One day, he visits the "Bird Encyclopedia", a specialty store that features birds from all over the world. What will happen when the boy meets Enji Kochikawa, the store's manager, who's full of dreams and wild ideas...!?

(Source: Kurage Bunch, translated)