"Kurenai," which translates to "Crimson" in English, is a manga series written and illustrated by Japanese artist Takuya Mitsuda. The series was later adapted into an anime television series. At its core, "Kurenai" revolves around Shinta Kurenai, a high school student who becomes involved with a group of girls known as the Crimson, who are idolized for their beauty and charm. The story navigates through themes of friendship, love, and the challenges faced by its characters.