One day, Shiro's all-time favorite idol Mami Mitsuya suddenly appears right in front of him! Even though this meeting left him excited, his partner Kenji ends up unhappy. Moreover, the appearance of a new partner and Shiro's work situation have led to the relationship between the two changing...
Unfortunately the movie What Did You Eat Yesterday? New Year's Special 2020 is not yet available on HBO Max.
| Directing | Kenji Katagiri | Director |
| Directing | Katsumi Nojiri | Director |
| Directing | Kazuhito Nakae | Director |
| Writing | Fumi Yoshinaga | Comic Book |
| Writing | Naoko Adachi | Writer |
