Cosmos no Sora ni (Japanese: 秋桜の空に, lit. In the Cosmos Sky) is a Japanese adult visual novel developed by Marron that was released for Windows on July 27, 2001. The story is told from the perspective of Yasuomi Nīzawa, who discovers more about his childhood memories as the high school cultural festival approaches. The gameplay in Cosmos no Sora ni follows a branching plot line which offers pre-determined scenarios with courses of interaction, and focuses on the appeal of the female main characters by the player character.