Shide

Shide (シデ, Shide) is a mysterious and unique Shadow. He serves Haine and wants to help her revive her. According to Heine, he is greed incarnate. He is also known as the four armed shadow or initially though to be a shadow parent by Hizuru. His real name is Shidehiko Hishigata, who married Haine and took her surname Karikiri. As their child was actually a clone of him, he made Haine transfers his personality and memories into him and kept getting reborn over and over. Currently he assumes the identity of Masahito Karikiri, a supposed descendant of Shidehiko.

Appearance
Shide has the form of a large tall man with four arms and four eyes. A female-like upper body is able to split from his top half, mostly when he attempts to shoot with his rifle.

Power & Abilities
Shide is more powerful than other shadows, being faster and stronger than them. Unlike other shadows, his movement can't be stopped by piercing his shadow three times which is likely due to the fact he is not a true shadow but rather a hybrid of human and shadow.

3rd Loop
At the shrine, after Shinpei and Hizuru arrive, Shadow Parent creates a female shadow from itself, who points a gun at Hizuru, but seeing a glimpse of the future, she manages to dodge the shot. Shadow Parent grabs Shinpei, and looking at its right eye, he realizes it must be the eye their Mother lost long ago. He wonders why he has it, but states he can control time with it. Shadow Parent states that if a "hero" dies, he can continue from a "save point" until it defeats the "Demon King", and the only way for the Demon King to win is to cut the "electrical power". He then tells Shinpei to observe him as he cuts the power. Shadow Parent consumes all human bodies and offers them as meal and asks their Mother to grant him the last of her strength. Mother then appears floating in the air in a shinning red light. Shadow Parent starts spreading across the island and consume anyone it touches. Shadow Parent attempts to consume Shinpei, but Ushio comes and punches him, giving time for Hizuru to kill Shinpei and send him back in time.

4th Loop
Ryunosuke and Ginjiro enter a cave with sea anemone, which makes Ryunosuke realize they are all shadows. As Shiori appears and knows Ryunosuke's name, Ryunosuke realize this is Haine, who uses Shiori's memories. The shadow parent appears, mentioning its been fourteen years, but he doesn't really have business with Hizuru and wants to know where is the body that stole mother's right eye. Shiori states she read Hizuru and Ryunosuke's mind, but they don't know where the right eye is. The shadow wonders if he can kill them and Shiori confirms. Ginjiro states they should run as they are the ones being hunted and that this isn't a shadow of a human. Shiori warns the shadow that Ryunosuke's shifted, about two seconds ahead. The shadow then shoots at Ryunosuke, but Ginjiro jumps in and takes the bullet. He then proceeds shooting at Ryunosuke, who manages to escape, but also gets shot. Looking at the blood, the shadow states its dark, which means he hit the liver and Ryunosuke won't have much to live. Shiori states that Ushio and Shinpei are with Tokiko and that she is getting hungry and can't wait for 9 o'clock.

When Shinpei was about to shoot at Haine, the shadow parent appears behind him and cuts his fingers and nailgun. He realizes that Haine was about to eat him, but tells her not to do it. He brings Mio and tells her to not eat her as she is an important hostage. Tokiko states they didn't agree on them dragging Mio into this, but the shadow parent states they will all die tomorrow, so it doesn't matter. He shoots at Tokiko, but Sou jumps in and takes the bullet. The shadow parent is surprised, but then shoots again Tokiko and kills her. Haine takes Shinpei's eye, but it returns back to him. The shadow parent states that Shinpei's right eye overlooks the flow of time from a higher dimension and observes multiple parallel worlds. He grabs Shinpei and tells him he has the power to make the world he observes into reality, and right now he is rendering this world. However, he hasn't mastered that power and he is only able to access it when he loses sense of himself in death. So they have to keep him alive until the very end. The shadow parent then crushes Mio's skull, killing her. The shadow intends to keep Shinpei there until tomorrow ends. Shinpei realizes he won't be able to loop and fails his promise.

Tetsu shows up, along with Hizuru, who shoots the shadow parent in the head and frees Shinpei. She then attempts to kill Shinpei, but the shadow creates a shield and protects him, while also shoots and kills Hizuru. The shadow then shoots and kills Tetsu as well. He notes that they almost lost Shinpei, but then sees that Shinpei drank a poison to kill himself. Haine attempts to reprogram Ushio, but Ushio starts turning her corrosion back at her. She tells the shadow parent to kill Ushio, but before he is able to, Shinpei dies and takes Ushio with him, looping them back in time.

5th Loop
The shadow parent goes to Shiori's house and when Ryunosuke attacks, he fights him. He eventually throws Ryunosuke out of the windows and then jumps out and smashes his head. Haine as Shiori reveals that the mark she left on Shinpei allows her to find him and that she can also loop. The shadow parent states they don't need two observers and the surviving one will see the true world. He then attacks Ginjiro, who tries to pin him three times with his nailgun, but that doesn't stop the shadow and he kills Ginjiro. The shadow parent then is about to capture Shinpei, but Ushio cuts Shinpei's head. The shadow attempts to kill Ushio, but she loops back with Shinpei.

6th Loop
Haine loops back in Shiori. Confirming what time it was, and the last times of the loops, she realizes the starting point is getting later. The four armed shadow, The shadow parent - Shide, guesses its because Shinpei's power is waning. Shiori is fine that they keep letting Shinpei loop, as that will give him less and less time, until he reaches his limit, thus they should focus on killing him than keeping him alive. A hour and more later, they go after Shinpei at the elementary school. Mio kills the scouting Ginjiro and Shide takes his rifle, snipping and killing Shinpei from distance.

7th Loop
Haine and Shide arrive with more shadows at the school and find Shinpei outside. They think its a trap, but Shinpei states he just wants to fight fair and square. They send Shadow Mio to kill him, but Ushio appears and they run with Ushio. Haine then orders the shadows to go and kill Shinpei, while Shadow Mio goes to take out Ginjiro, who had started shooting at them. They encounter Hizuru in a corridor, who defends Shinpei and kills all shadows that come after him. Hizuru sees that Shide will shoot Shinpei and takes the bullet, saving him, making Haine note that she knew she would do that as she too has the sight and is able to see two seconds into the future. Shide is about to finish Hizuru, but Ginjiro shoots at them, making Haine wonder what Shadow Mio is doing. Haine then sees Shadow Mio is fighting two stray shadows commanded by Tokiko and is surprised by her betrayal. She tries to order the shadows that Tokiko isn't their master and to kill her, but the shadows don't listen, making her realize that Ushio had severed the connection between them. Angry, Haine merges all shadows into Shide and heads after Ushio.

They reach the gymnasium, where Ushio copies gasoline and Shinpei ignites it. While burning, Haine with Asako jumps at the ceiling, but is shot by Shinpei and injured. Ushio then grabs her and prepares to erase Shiori, but Heine starts begging not to as she wants to take her and her family with her and live with them. Distracted for a moment, gives Shide a chance to grab and pull Ushio into the fire, while also shooting at Shinpei, but purposely missing vital organs, so he dies slowly and after Ushio. However, Ushio reveals to be a dummy and appears behind Shide, punching him and starts to erase him. Haine scans the air in the gymnasium and erases it, putting out the fire and creating vacuum that causes the windows to burst, giving them chance to escape. Haine then asks Shide if he is fine and Shide confirms that he will be able to reconstruct, however, all other shadows have died from the fire.

Shinpei visits Masahito and tells him that he believes the shadow exist and that Masahito was there from the beginning of the Hiruko legend, pointing a gun at him and calling him Shidehiko Hishigata. Shinpei shows him 70 and 40 years old pictures of Masahito and Haine with Masahito and a baby, stating that he is a human-shadow hybrid. As Masahito doesn't deny it, Shinpei eventually feels something is strange and he sees that Masahito doesn't have the burn on the left arm, which Shide received in their last fight. Ushio comes out and kills Masahito, but moments later another Masahito with burnt left arm shows up and stabs Ushio with a spear and then slashes her. Shinpei shoots three times at him, but Masahito turns into Shide, blocking the bullets and throws his spear piercing Shinpei and sending him flying outside the shrine and pinning him to a tree. Shide then tells him that he should have been a bit more objective, but now with Ushio dead, he will loop back only with despair and regret.