Summer at the Edge of the Universe is a solarpunk lesbian visual novel. After several years without talking, a chance encounter brings four best friends back together for the journey of a lifetime. For Summer Nansen (CV: Hikaru Station), this trip is a chance to not only rekindle old friendships, but also to discover what it is she wants out of life. Joined by the spunky robot Curiosity, the four girls travel from planet to planet, exploring the natural wonders and diverse alien cultures that they come across. Their journey culminates at the borderline of existence itself: the very edge of the universe.