It is a visual novel for adults developed and published by Lass first released on April, 2008 for Microsoft Windows as a DVD; 11 eyes is Lass fourth game. The opening theme is "Arrival of Tears" by Ayane, and the ending theme is "Sequentia" by Asriel.
After losing his sister seven years ago, Satsuki Kakeru leads an empty life, being able to return to normal only with the help of her childhood friend Minase Yuka and other friends at school.