Invoke

Kai, who receives the "virtual-dream," a machine allowing one to dive into a virtual reality of multiple worlds and times, meets a man in the virtual world. This man introduces Kai to out-of-this-world sex within virtual reality. Unable to forget him, Kair dives again into the virtual world in search of him. Is this feeling lust? Or is it love? Note: This manga series has been dropped by the mangaka.