Summertime Rendering is a mystery thriller anime about Shinpei Ajiro, a young man who returns to his rural hometown of Hitogashima Island for the funeral of his childhood friend Ushio. Soon after arriving, he learns Ushio’s death might not have been an accident and gets pulled into a deadly struggle against shadowy doppelgangers called "shadows" that can copy and replace people. Shinpei discovers he has the ability to rewind time after dying, allowing him to relive loops and uncover the truth behind a centuries-old curse on the island. Readers enjoy the show for its high-stakes time-loop plot, clever twists, intense horror elements, and the way Shinpei uses each reset to outsmart enemies and protect his friends.