Sinless World

A concept/location from Higurashi no Naku Koro ni.

Description
A rarity even amongst the most strange of worlds, a pure and clean world that exists within a perfect dream. Causality is altered, and ratio of goodness to misfortune is reversed.

A world that exists without sin.

TFR/Off-Season 8
After getting hit by a Shot-Put Ball while in the Diamond Realm, Leon S. Kennedy wakes up in such a world. Soon after he learns Fred Jones doesn't know him at all and is actually quite different, having a much more abrasive personality, while he himself is still a cope along with Suou Tatsuya.

Unable to find a way to return to The Vents and becoming increasingly uneasy about the alien nature of this world, Leon's mental state deteriorates until he assaults Fred Jones with a steel chair and is dragged away by police. At that time, The Cookie shows itself and announces that Leon can't leave because the Leon of this world isn't the kind of Leon that can access The Vents, and to escape he'll have to return to himself; but that entails changing this Leon's point of change: Chris Redfield. As Chris never lost his squad, he never had a fear and trauma of loss to create his obsession, in turn allowing him and Leon to become steadfast friends and turn around the latter's life. By introducing such grand sin into this world as killing Piers Nivans and Enrico Marini, he could escape before his connection to The Vents grew too dim at the end of the next day. Despite heavy consideration, Leon believed he could never bring himself to do such a thing. Upon visiting Fred at the hospital, he would notice he had already brought sin into this world, and tried to make amends until the day ended.

Leon would eventually wake up back in the Diamond Realm, and the nature of this world, along with the grave sin he committed, being real or a dream, would remain unknown.