Trinoline Genesis — after the side stories of the three heroines of the original game Sarah, Shirone and Yuri. Brand new character routes for the minor heroines of the original game Ayaki and Hanako. One hot day in mid-summer, Shuna Nanami’s sister, Shirone Nanami, drowned in the sea. It is a memory he will never forget the one that will stay in his heart forever. He has been swearing since then to live in his place and make up for a life she has never had. Time passes, and now Shun spends his days at school like any other student.