Struggling with intimacy in his relationship, Kazuaki accidentally sends an email to a stranger, changing everything.

Kazuaki and Sei continue exchanging emails, unaware they work at the same company, while their love lives grow complicated.

After Kazuki rejects his advances again, Sei confides in his mysterious pen pal, who is struggling with his own romance.

After discovering each other's identities, Kazuaki and Sei grow closer as their partners remain blind to their struggles.

A heartbroken Kazuaki reaches out to Sei, and their meeting at a hotel forces them to confront their growing feelings.

Despite promising not to disrupt their lives, Sei can't stop thinking about Kazuaki as Kazuki proposes a fresh start.

After breaking up with Kaori, Kazuaki avoids Sei, who tries to convince himself their feelings were nothing but loneliness.