Rakka RyūsuiRakka Ryūsui.

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. The series began its serialization in Manga Time Kirara Max in 2006. The main character is Akiho Hayama, and the story is about her comedic days at the kyūdō club at Sakuraba Girls' High School (桜庭女子高校, Sakurabajoshikōkō), an all-girls school.