Yuami is a Japanese manga artist and illustrator, recognized as the original creator of the manga series Koala's Diary. The series began in June 2021 when Yuami started posting short, four-panel comic strips on social media, featuring the daily life of a koala. The relatable and gentle humor of these posts quickly gained a following. The success of the online series led to its acquisition by the publisher Kadokawa, which began releasing compiled print volumes in March 2022. As of February 2025, four tankōbon volumes have been published.

The popularity of the original manga led to an anime adaptation. In June 2025, it was announced that Koala's Diary would be produced as an original net animation, a web anime series. The anime is directed by Takao Kato and animated by Studio Mother, with character designs by Chiharu Hara. The series began streaming on YouTube in October 2025.

Yuami's work is characterized by a focus on the small, often humorous details of everyday life, using an animal protagonist to explore universally relatable moments. The artistic identity is defined by a simple, expressive art style that conveys a range of emotions, from minor frustrations to quiet contentment, with an overarching tone of warmth and comfort. The creator's career exemplifies a modern path to publication and adaptation, originating in independent social media creation before transitioning to traditional publishing and screen media. This trajectory highlights the contemporary trend of grassroots content gaining recognition within the mainstream anime and manga industry.