Rakka Ryūsui (落花流水 (らっかりゅうすい)) is a Japanese 4koma manga written and illustrated by Ikki Sanada.
After learning that she had passed the entrance examinations to enter the Sakuraba Girl's High School, Hayama Akiho, while attempting to escape from club recruitment staff, experiences love at first sight when she meets the president of the kyūdō club, Hokaze Minatsu.
Rakka Ryūsui is written and illustrated by Ikki Sanada, it is currently being serialized in the Japanese magazine Manga Time Kirara Max published by Houbunsha starting in 2006.
It was then green-lit into a full manga series by the author with its first chapter published in April 2006, compiling it into 9 volumes.
A Rakka Ryūsui light novel, written by Hiro Akizuki and illustrated by Ikki Sanada, was published by Houbunsha on July 27, 2007.