Sou Hishigata

Sou Hishigata (菱形窓, Hishigata Sō) is a 17-year-old boy who is Shinpei's childhood best friend. He is the eldest son of Hishigata Clinic, the only hospital on Hitogashima, and is studying to become a doctor. He has a strong sense of justice and regrets that he was present at the scene of Ushio's maritime accident but was unable to prevent it. He has confessed his feelings to Mio twice in the past and was rejected.

Appearance
Sou is a young man with messy brown hair and brown eyes.

Plot
At Ushio's funeral, Sou hugs Shinpei and apologizes for not being able to help her. He offers Shinpei to punch him until he feels better, but Shinpei refuses. Sou explains that Ushio died while saving a kid, Shiori Kobayawaka, but the girl haven't spoken since then. That evening, Sou calls Shinpei and explains the rumours about his father performing an autopsy is false, but they did find strangler marks on Ushio's neck. However, given the situation and the police labelled it as an incident and only a few people know about the neck marks.

When Shinpei lives the day for a third time, Sou visits him at Kofune's Diner, where Shinpei tells him about Shadows. Mio suggest they go to Hiruko Shrine and speak with the priest, but Shinpei convinces them to go the next day during the Summer Festival, as being more crowded would be safer. Before leaving, Sou wants them to have a code word and Mio suggest Mesopotamian culture. Sou then leaves, wanting to check on something before tomorrow, but the next when Shinpei asks him, Sou states it was nothing. During the festival as Shinpei blames himself for not protecting Ushio, Sou tells him it wasn't his fault and he need to protect Mio now, but if he doesn't, Sou will protect her for him, making Shinpei realizes that Sou still has feelings for Mio. Sou explains that after the fireworks, the priest would be free and they can visit him then, but Shinpei sees something and leaves the group. When the fireworks end, Mio calls Shinpei and he joins them. After the ceremony, Sou decides to confess to Mio, but Mio explains she wants to be friends with him. Ushio then appears and comforts Sou, but everyone see through her disguise. Mio thinks she is a shadow and warns Shinpei to stay away from her, but Shinpei himself reveals he is a shadow.

Other shadows appear and they start killing people. A shadow that copied Sou, attempts to kill Mio, but Sou uses his body to protect her and Shadow Sou kills him, hitting him in the head with an axe.

Sou meets with Shinpei at Kofune's restaurant. Shinpei takes two umbrellas and they leave, which surprises Sou as its sunny outside. They go to the beach, where Sou wants to tell him something related to Ushio's death. Ushio then shows up behind him and guesses its the strangle marks, which makes it look like she was murdered. Sou confirms, but then sees Ushio and ends in a shock. After they tell him everything, Sou apologizes for not being able to save Ushio and wants she to punch him. Ushio then kicks him and tells him to get up as they rely on him. Shinpei gives her phone and after unlocking it, they find a video from the morning when Ushio died.

Etymology

 * The name Sou means "window" (窓).
 * Sou's surname Hishigata means "Rhombus, diamond shape" (菱形).