The 18th volume of the I’ve Been Killing Slimes for 300 Years and Maxed Out My Level manga announced that the next issue will bring the series to an end. The art is done by Yusuke Shiba, adapting the light novel created by Kisetsu Morita and illustrated by Benio. Square Enix has been running the series on its Gangan Online portal and mobile app since June 2017.
I’ve Been Killing Slimes for 300 Years and Maxed Out My Level Franchise Overview
Kisetsu Morita originally posted Suraimu Taoshite Sanbyaku-nen, Shiranai Uchi ni Reberu Makkusu ni Nattemashita on the user‑generated site Shosetsuka ni Naro in 2016. The work was later picked up by SB Creative, which launched a printed edition in 2017 under its GA Novel label, with Benio handling the illustrations. The publisher has since released 29 volumes of the light novel, and Yen Press handles its English publication, covering both the novel and the manga.
The light novel series I’ve Been Killing Slimes for 300 Years will conclude with its 30th installment this coming October.
Kisetsu Morita has produced multiple side‑story light novels, each illustrated by a distinct artist.
- I Was a Bottom-Tier Bureaucrat for 1,500 Years, and the Demon King Made Me a Minister (illustrated by Meishi Murakami).
- Food for an Elf
- Red Dragon’s Women Academy (illustrated by Hitsujibako).
- The White Journey of Margrave
Both Red Dragon’s Women Academy and I Was a Bottom‑tier Bureaucrat have been adapted into manga by the artists who illustrated their light‑novel versions.
The TV anime I’ve Been Killing Slimes for 300 Years was produced by Studio Revoroot and Studio Teddy, with Revoroot handling the first season and Studio Teddy the second. Both seasons are available for streaming on Crunchyroll.
Synopsis
What does relentless labor and a life of overwork earn you? For Azusa Aizawa, the answer was a premature death. Yet, unlike the typical fate, Azusa is reborn into a different realm. A kind deity, moved by her hardships, transports her to a magical world and grants her immortality, placing her soul within a 17‑year‑old’s body.
Over three centuries, Azusa settles into a tranquil existence in the highlands, slaying slimes to survive. The relentless battles unintentionally elevate her abilities to near‑divine status. Nonetheless, she remains committed to enjoying a relaxed lifestyle. Whether dragons, elves, slime spirits, or ghosts intrude, she invites them into her home and demonstrates the joys of a carefree life.



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Source: I’ve Been Killing Slimes for 300 Years and Maxed Out My Level manga
© Kisetsu Morita • Yusuke Shiba / Square Enix
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