 To do so, he must collect certain "lights" (symbols of happiness) similar to those floating around in the Illusionary World.If all the "lights" are collected throughout both story parts, a chance to save Nagisa from dying will become available, as well as the true ending, where she survives and lives with Tomoya and Ushio.The executive producer for "Clannad" was Takahiro Baba from Visual Arts, the publishing company which controls Key.