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Earnest and well put together, Sada is a teacher that's popular among both his colleagues and students alike. One day after school, while he was on patrol, he saw a suspicious figure attacking a female student with a knife. Unable to escape in time, Sada ended up losing his life. However, Sada woke up on a cold slab... (Previously serialized with the title 'Living Dead')

Sei, a salaryman only interested in strictly sexual relationships gets hooked on the handsome Ai, who is 16 years his junior. Initially, they resolve to maintain clear boundaries as sex friends, and yet...