All of Them Are Troublesome Girls!(2019)

Kunihiko Kunitachi is a Japanese language teacher at a high school. Kazumi Kazumiya is a student there. She doesn't have any friends at school and asks Kunihiko Kunitachi to be her friend. He accepts her offer, but she begins to follow him around. Kunihiko Kunitachi becomes annoyed with her for following him around. He encourages her to make other friends, but Kazumi Kazumiya doesn't try to make other friends. Kunihiko Kunitachi tries to make friends for Kazumi Kazumiya, but his life becomes more complicated.

Official site