Touhou Risouen: Terminus of Unreal Darkside

Despite the bright spring sun blazing high in its skies, Gensokyo has been gripped by the chill of winter. Ponds have inexplicably begun to freeze, plants have begun to wither, and yet the sun goddess's face still shines from high above. It's as if the sun has simply stopped working properly. A mysterious light leads the protagonist to a tranquil valley, where she expects to find some answers-- but will the answers be as straightforward as the incident's surface appearance would suggest?