Kazuaki is troubled by the lack of intimacy with his live-in lover. Meanwhile, Sei, his childhood friend and co-worker who lives with him, harbors unrequited feelings for Kazuaki. One day, Kazuaki's email is mistakenly delivered to Sei, and they continue to have a strange relationship where they confide their worries to each other by email, without knowing each other's true identities. This is the ultimate love story of two people at the mercy of unrequited love and sex.