Sai no Kami(2008)

Sai no Kami

The colourful story of Aya, Hina, Kei, and their classmates, trying to figure out the mystery behind Risa's sudden disappearance. It all begins with the discovery that her disappearance has some correlation to the online dating site called "Amore." Hina proposes that they should try out the site first-hand themselves, and upon doing so, they encounter something completely unexpected?!

(Source: Kirei Cake)