Wo Kai Dongwuyuan Naxie Nian
English name: Those Years I Opened a Zoo
Genres: Comedy, Slice of Life
Type: ONA, Episodes: 13
Aired: Apr 5, 2020 to Jun 21, 2020
Studio: Haoliners Animation League
Source: Novel
Rating: PG-13 - Teens 13 or older
Synopsis:
Duan Jiaze inherited a private zoo and was forced to sign a contract after his graduation. And from that day onwards the first ever age classified Luya zoo appeared, those aged under 21 are prohibited to enter.

(Source: Twitter User Xiyoumiyu)