is a Japanese light novel series written by Tadashi Kubà  and illustrated by Hana Amano. It initially began serialization on the user-generated novel publishing website Shà Âsetsuka ni Narà  in April 2020. It was later acquired by TO Books who began publishing it under their TO Bunko imprint in March 2021. A manga adaptation illustrated by Bokutengo began serialization on the Nico Nico Seiga website under TO Books' Comic Corona brand on September 20, 2021. An anime television series adaptation produced by Typhoon Graphics and Wonderland aired from July to September 2025.
Ryo, a man reincarnated into the fantasy world of Phi, is granted aptitude for water magic. Hoping to live a slow and peaceful life while studying magic, Ryà  instead finds himself in an isolated and dangerous region filled with powerful monsters. Forced to rely on his ingenuity and growing magical ability to survive, he gradually refines his control over water magic while adapting to life in the wild.
Ryo slowly accumulates strength, aided by his optimistic personality and a rare trait that halts his physical aging. His long journey of survival and self-improvement eventually leads him to back to human society. His abilities begin to influence events on a much larger scale, which comes into conflict with his desire for a peaceful life.
Written by Tadashi Kubà Â, The Water Magician initially began serialization on the user-generated novel publishing website Shà Âsetsuka ni Narà  on April 1, 2020. It was later acquired by TO Books who began publishing it with illustrations by Nokito under their TO Bunko light novel imprint on March 10, 2021. Later volumes feature illustrations by Mebaru (for volumes 3 to 6) and Hana Amano (for volume 7 and onwards). Seventeen volumes have been released as of February 15, 2026.
During their panel at Anime NYC 2023, J-Novel Club announced that they had licensed the series for English publication. In February 2026, J-Novel Club announced that the series would begin a print release in August 2026.
A manga adaptation illustrated by Bokutengo began serialization on the Nico Nico Seiga website under TO Books' Comic Corona brand on September 20, 2021. The manga's chapters were collected into eight tankà Âbon volumes as of February 2026.
During their panel at Anime NYC 2023, J-Novel Club announced that they had also licensed the manga adaptation for English publication. In February 2026, J-Novel Club announced that a print release for the manga would begin in July 2026.
A manga adaptation of the second part of the novels illustrated by Kaworu à Âshima began serialization on TO Books' Corona EX manga website on July 7, 2025. Its chapters have been collected into a single tankà Âbon volume as of September 2025.
A spin-off manga illustrated by Yuchi Sumika titled The Water Magician Gaiden: Penelopeia no Namida began serialization on Corona EX on July 14, 2025.
An anime television series adaptation was announced on January 10, 2025. It is produced by Typhoon Graphics and Wonderland, and directed by Hideyuki Satake, with scripts written by Jun Kumagai, character designs by Yà «ka Kozutsumi, and music composed by Akira Kosemura and Sayaka Aoki. The series aired from July 4 to September 26, 2025, on TBS and BS11. The opening theme song is , performed by Meiyo Densetsu, while the ending theme song is , performed by Misaki. Crunchyroll is streaming the series.
Lauren Orsini of Anime News Network gave the first light novel volume a score of 2/5 stars, writing, "Did anyone else read My Side of the Mountain by Jean Craighead George when they were a kid and vowed to run away from home and live a self-sufficient life in the forest along with their trusty pet hawk? That's a high I've been chasing since childhood, and I nearly found it between the pages of The Water Magician." She added, "So Ryo comes with [Abel], and the pair battle their way through the jungle, and then the mountains, until they reach the Adventurer's Guild, turn in the magic stones they found in all those wyverns they one-shotted, level up their ranks, and oh look, it's suddenly a very cookie-cutter isekai story that you could find anywhere... You also won't be surprised to hear that Ryo is (yawn) the strongest person in the Adventurer's Guild. So much for this story's strong start. This is only the first volume, but I won't be reading the second."