11eyes: Tsumi to Batsu to Aganai no Shōjo (Japanese: 11eyes -罪と罰と贖いの少女-; lit. 11eyes: Sin, Damnation, and the Atonement Girl), known simply as 11eyes in its anime adaptation, is a Japanese adult visual novel developed and published by Lass first released on April 25, 2008, for a Microsoft Windows PC as a DVD; 11 eyes is Lass' fourth game. A port playable on the Xbox 360 entitled 11eyes CrossOver was released on April 2, 2009, published by 5pb. A manga adaptation illustrated by Naoto Ayano began serialization in the October 2009 issue of Kadokawa Shoten's Comp Ace magazine. An anime television series adaptation by Doga Kobo aired in Japan from October to December 2009. A fan disc for Windows entitled 11eyes -Resona Forma- was planned for release at Fall 2010. The anime has been licensed in North America by Sentai Filmworks; distributor Section23 Films announced that it would release the complete box set on January 11, 2011.

Since losing his sister seven years ago, Kakeru Satsuki lived a detached life. He only regained a sense of normalcy through the support of his childhood friend, Yuka Minase, and their other school friends. One day, the sky turned red, the moon turned black, everyone around Kakeru and Yuka vanished, and monsters appeared in the streets. They named this altered reality "Red Night." After several similar occurrences, they encountered four other people affected by the phenomenon: Misuzu Kusakabe, a red-haired swordswoman and onmyouji; Kukuri Tachibana, a silent girl who physically resembled Kakeru's deceased sister and shared her name; Yukiko Hirohara, a cheerful girl who transforms into a cold killer when her glasses are removed; and Takahisa Tajima, a pyrokinetic with a fiery personality. Kakeru, wanting to repay Yuka's kindness and support, struggled to awaken his own latent power, which Misuzu assured him would eventually manifest. These six individuals united to survive using their unique abilities, but they became targets of grotesque creatures known as "Black Knights", who sought their deaths. The situation became more complex when the group discovered a girl named Lisette trapped within a red crystal, guarded by the Black Knights. She pleaded for their rescue. The series explores the mystery of Red Night, the identities of the Black Knights and their connection to Lisette. It also examines the significance of Kukuri's resemblance to Kakeru's deceased sister and the nature of Yuka and Kakeru's powers.