Heroine Jijou(2018)

Heroine Jijou

One day, Hana, a high school girl who is in love with Karasugi, a senior at her part-time job, decides to confess her feelings. Hana heads to work with great vigor, but her senior comes out to her and says, “I am a fighter of a secret evil society...⁉

(Source: YanJan!, translated)