Haine

Heine (ヘイネ, Heine) is the God of Hitogashima, Hiruko no Mikoto and "Mother" to the Shadows. She takes the appearance and the name of the first person she copied, Heine.

3rd Loop
The parent shadow offers large amount of humans to Heine, who then appears in the sky and shines in red. As the shadow spread and consumes all humans on the island, Heine licks her lips for the good meal. Shinpei asks Hizuru to kill him, so he can return in time and as she does, he starts floating in a ghost-like form. He looks at Heine, who also turns and looks at him, but he then travels back in time.

4th Loop
On the fourth loop, Shadow Ushio replays the death of Ushio for Shinpei and Sou. At the end, Shiori grabs Shinpei's arm, surprising him that they can interact, however, Shiori then turns to Heine, who tells Shinpei that she found him finally and won't be letting him go. However, Shadow Ushio ends the replay and they manage to escape Heine.

Tokiko takes Shinpei, Shadow Ushio and Sou in front of Heine. She explains that Heine is Hiruko, the god of the island and likes to be called and look like Heine, the first person she copied. Lately, she had issues walking and needed a body replacement. Heine then turns into Shiori, making Shinpei realize its Heine who killed Ushio. Tokiko calls Negoro, who brings two coffins for Heine. Tokiko explains that her family for generations have been bringing all the dead from the island for Heine to eat. Heine then eats the first body and prepares to eat Ushio's body, but Shinpei asks Shadow Ushio to print him a nailgun. With it, he frees Ushio, who then takes Ushio's body. Annoyed, they stole her food, Heine transforms Negoro into a more wild and muscular form, but she ends up defeated by Ushio. Shinpei then gets close and points the nailgun at Heine, but the shadow parent shows up and cuts his fingers. He notes that Heine was about to eat Shinpei, but mustn't and Heine confirms, as she was annoyed they stole her food. He promises to take Ushio's body back and shows he has Mio, but tells Heine to not eat her as well as she is important hostage. As the shadow kills Sou and Tokiko, Heine takes Shinpei's eye, but the eye returns back to him. Since Ushio had became quite strong, she decides it would be a waste to kill her and decides to reprogram her so that she can help at the festival. She starts corroding her, but after Shinpei takes the poison and starts dying, Ushio manages to withstand the corrosion and turn it against Heine. Heine tells the shadow to kill Ushio, even if he needs to kill her as well. The shadow jumps in to kill Ushio, but Shinpei dies and takes Ushio and loops back with her.

5th Loop
At the Kobayakawas, Hizuru and the rest appear to kill Shiori, however, she is with the four-armed shadow, who then kills Hizuru. Shiori asks Shinpei if he remembers when she told him she found him and gave him the black mark on his hand. From then on, she always knew where he was. She has been chasing him ever since their eyes met at the summer festival. Heine then reveals she can loop as well. She shadow states that they don't need two observers and the true world will be seen by the one who survives. The shadow then attacks and kills Ginjiro. The shadow then surrounds Shinpei and is about to capture him, but Ushio cuts Shinpei's head. As the shadow is about to smash her, Shinpei's loop is activated and Ushio vanishes with Shinpei. Heine is fine with that, as this was just a greeting and knows that no matter how many times he loops, she will eventually catch up to him.

6th Loop
Heine 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 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 a bit later, they head for Shinpei at the elementary school. After killing the scouting Ginjiro, Shide takes his rifle and snipe kills Shinpei.

Etymology

 * Her original name translates as "Leech Child".

Trivia

 * Her inability to walk is likely a reference to the shinto mythos regarding Ebisu/Hiruko, who was born without legs.