Koala's Diary

Koala's Diary (コアラ絵日記, Koala E Nikki) is a Japanese manga series written and illustrated by Yuami. Originally serialized as a web manga on Twitter since June 2021, it was later acquired by Kadokawa Corporation, who then began publishing the series in print in March 2022. Four tankōbon volumes have been released as of February 2025. An original net animation (ONA) adaptation produced by Studio Mother is scheduled to begin releasing on YouTube in October 2025.

Koala's Diary
First tankōbon volume cover
コアラ絵日記 (Koala E Nikki)
Manga
Written by	Yuami
Published by	Kadokawa Shoten
Original run	June 11, 2021 – present
Volumes	4
Original net animation
Directed by	Takao Kato
Studio	Studio Mother
Released	October 2025 – scheduled

Characters

Koala (コアラさん, Koara-san)

Voiced by: Aya Uchida^[1]

Media

Manga

No.	Japanese release date	Japanese ISBN
1	March 17, 2022[2]	978-4-04-680919-3
2	December 22, 2022[3]	978-4-04-682116-4
3	December 26, 2023[4]	978-4-04-683176-7
4	February 14, 2025[5]	978-4-04-684477-4

Anime

An original net animation (ONA) adaptation was announced on June 11, 2025. The series is animated by Studio Mother and directed by Takao Kato, with Chiharu Hara designing the characters.^[6] It will begin releasing on YouTube in October 2025.^[1]