Summer Time Rendering made its debut alongside other spring 2022 anime, however, the story’s plot quickly set it above its peers. The show features a shadow-based mystery haunting the island of Awajishima – the hometown of Shinpei Ajiro, the story's protagonist. Upon Shinpei's arrival on the island following the death of his friend, he discovers that there is more to her death than he initially perceived. Still, Shinpei brushes off her sister Mio's deductions when she suggests that Ushio, was killed by her doppelganger.