Rewind Syndrome is a rare disease that causes one's body to revert back to the past. Yukihiko takes advantage of this disease to find men more muscular than him on his secret account, and enjoys having sex with well-hung guys ♪
One day, a guy named Nagi shows up as his partner for the night, but his behavior is strange...?!

Note: Includes one extra chapter.

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• Sattsu Kida — Story & Art