Azusa is a character who appears in the anime film Gekijōban Ansatsu Kyōshitsu Minna no Jikan. She is not part of the main recurring cast from the television series but is introduced as a new character in this theatrical release, which adapts stories from the original manga that were not previously animated. In the film, she is depicted as a mother who is blind and the proprietor of an izakaya, a Japanese-style pub, named after her.

Her role in the story is significant as she becomes a recipient of Korosensei’s unique abilities. Because of her blindness, Azusa has a tumor that causes her condition. Korosensei, demonstrating his remarkable precision and care, removes the tumor for her. The consequence of this act is that Azusa regains her eyesight. This event is particularly poignant because, in regaining her vision, she becomes one of the few, if not the only, character to see Korosensei in his true, human form. This moment highlights a key aspect of Korosensei’s character—his desire to use his powers to help others in meaningful, personal ways, rather than solely for his role as a teacher or an assassination target.

While specific details about her personality and broader motivations are limited to her appearance in this single film, her character serves as a narrative device to provide a deeply human and emotional connection to Korosensei's past and his nature. Her background as a blind mother running a small pub establishes her as an ordinary person living a humble life, which contrasts sharply with the extraordinary, high-stakes world of the assassins and the military operations typically surrounding Korosensei. The izakaya she runs also serves as a familiar location for other new characters introduced in the film, such as a regular customer named Futoshi. Through her brief but impactful story, Azusa's experience underscores the themes of healing, second chances, and the unseen kindness that defines Korosensei's relationships with those around him.