Siren topic guide
Which Chapter Features Siren's Final Scene? A Walkthrough of the Original Manga Posts
The last time Siren is directly depicted in the original story is near the end of "Today, Forever Farewell" in volume 8 of the collected editions. We follow the original posts from the first encounter to the final song, to see where the rage over the Mermaid ultimately landed.
Siren's final direct appearance is in volume 8, "Today, Forever Farewell"
The last time Siren is directly depicted in the original story is near the end of "Today, Forever Farewell," in the Island Arc (Siren Arc) in volume 8 of the collected editions. Siren appears before the islanders with a Mermaid on its head and takes the decisive action of lifting one person toward its mouth. While everyone around freezes, the scene ends with Siren's and the Mermaid's light singing voices overlapping. Because the cheerful tone returns right after such a grave event, it is an unsettling ending that cannot be closed with relief alone.
In the original posts that follow, the story moves to Chiikawa and friends spending their last night on the island, and Siren itself never appears again. Words of toast around a bonfire show that the Island Arc's turmoil has ended, but no epilogue explaining Siren's feelings is inserted. Therefore, if you are looking for Siren's final moment in the story, the answer is the scene where the singing of "Today, Forever Farewell" lingers.
Fan theories: The ending cannot be reduced to a simple "victory" among Japanese fans on X
Some fans say they cannot take the ending as a simple victory or resolution, and that a bittersweet sorrow or lack of salvation remains. In movie theaters, there were also observations that while adults teared up at how heavy the story was, children accepted it as an ending where Siren was defeated. The very same scene seems to flip depending on the viewer, and even the divided aftertaste is what makes it so strongly remembered.
On the other hand, some interpret Siren as a natural disaster- or god-like being that cannot be reasoned with, while others read the mutual misunderstanding with the islanders not as a one-time incident but as a matter of ongoing preparedness. Conversely, some reactions hold that Siren itself was in the wrong from the start. All of these are fan interpretations, and the original work does not settle on a single answer.
Up to the final scene: Searching the island for the lost Mermaid
Siren explains that there were originally three Mermaids, and they lived together singing as a group and picking bugs off each other's bodies. But one companion was lost, and suspicion arises that someone on the island was involved. The Mermaids also report that someone came from the village's side, and Chiikawa and friends begin considering the clues. By the bonfire, Siren speaks of the realization of having lost the one it shared daily songs and care with. It is an introduction in which, amid the gentle warmth of the fire, only the embers of anger refuse to go out.
Chiikawa and Hachiware look through books in a building and come across rumors of eternal life surrounding the Mermaids. The interests of those who would use Mermaid scales also loom behind the reason their number dwindled. Around the same time, Siren captures islanders and shows a stance of pressing them until whoever was involved comes forward. When Rakko asks whether Siren is searching for the culprit, Siren's answer makes clear that the desire to reclaim its companion has turned into dangerous action against the entire island.
A missed connection with the search party turns into a pursuit
Before Chiikawa, Hachiware, Usagi, and Furuhonya, who were searching the water's edge, Siren appears with a Mermaid on its head. Siren assumes the group has brought the person responsible and reacts with delight. It makes gestures as if returning the captive and the little Mermaid, and begins singing in a bright tone, but Chiikawa and friends did not come with that intent. The islanders also watch anxiously. With Siren's and the group's objectives still at odds, only the face-to-face meeting progresses.
With the misunderstanding unresolved, Siren's expression changes, and black shadows, giant leaves, and stretching vines appear around them. The plants spread as if to rob the group of any escape route, and the meeting meant for the search turns into a crisis engulfing the whole forest. Chiikawa, separated from companions, is chased, and even crouching behind a hill with Hachiware, they are found. When Chiikawa takes a wrapped candy from the pochette (shoulder bag) and throws it, Siren's eyes chase the flying candy, and in that opening Chiikawa dashes off in the opposite direction. It is a desperate scramble of escape exploiting a moment's distraction.
Anger and agitation revealed through the curry strategy
The islanders and the group try a plan of delivering curry using vines so as not to get too close to Siren. Chiikawa has vines wound around its head and is lowered while suspended in midair, together with Hachiware, still holding a wooden ladle. The large creature pulling the vines and the companions bracing themselves beside the pot keep their distance. But Siren shows displeasure that the reward for singing and dancing was too small, twists the offered handle out of shape, and cries out for something truly delicious. A single prepared dish cannot settle either the longing for its lost companion or the accumulating frustration.
Afterward, Siren, crying and swinging its tail around, sends a nearby islander flying. When Chiikawa and Hachiware signal the danger and Siren itself sees the islander tumbling at that moment, it freezes, covering its mouth. When Shimajiro calls out through a megaphone, asking it not to attack anymore, sobbing comes back from the darkness. It is a scene that refuses to reduce Siren to a simple threat, as its towering rage and its shaken expression at having hurt someone appear at the same time.
Siren's emotions shown through red eyes, song, and its enormous body
Early in the Island Arc, Siren rises hugely from the water in front of the small boat that had been keeping time with the Mermaids' song. Its eyes turn red, and the companion Mermaids float small at its side. Even as Chiikawa, Hachiware, and Usagi try to row the boat away with oars, Siren pushes through the water in pursuit. The waves lift the small boat high, and finally the three and the boat are thrown into the air. The scene of listening to the Mermaids' song turns into a direct pursuit and the danger of capsizing.
At the same time, what underpins its actions to the very end is its bond with the Mermaids. It carries a Mermaid on its head, recalls the songs of the three and the daily care when speaking of its lost companion, and returns sobs immediately after hurting an islander. The red eyes, enormous tail, and power to control plants create terror, but the song and tears show that it is moved by loss. Because loneliness shows through inside its gigantic form, even the final light singing leaves something that cannot be neatly resolved.
After Siren's scene, the story continues to the last night on the island
After the scene of Siren singing with the Mermaid, the perspective shifts to Chiikawa and friends gathered around a nighttime bonfire. Shimajiro asks whether they were able to rest after the battle and whether they will go home tomorrow. Hachiware confesses that they originally came to the island hoping for a big reward, and says that once they return, they will have to keep working hard again. Kurimanju holds a can, Shisa hugs some yakisoba, and ordinary mealtime scenery returns to the island that had been tense for so long.
Shimajiro raises a cup and toasts the fact that the battle with Siren has, for now, come to an end. What is shown here is the milestone of finishing the battle and returning to everyday life. Because Siren, which shook the island until moments before, is absent from the circle around the nighttime bonfire, the reverberation of that final song feels all the stronger. Including the quiet after its disappearance, it is a farewell that unwinds the Island Arc's long tension.
After the Island Arc, Siren also appears in announcement illustrations
Even after the Island Arc's main story ended, the original author's account posted artwork featuring Siren. In the announcement of the movie's release date on February 27, 2026, a laughing Siren on the water energetically tosses Chiikawa, Hachiware, and Usagi, who wear green rings around their necks and ornaments on their heads. In the foreground are two small, red-bodied Mermaids, with splashes of water, motion lines, and a shout as they are tossed.
However, this illustration is not a continuation of the story but an announcement that the movie's July 24 release was confirmed. If you want to check the end of the Island Arc, it is volume 8's "Today, Forever Farewell"; if you want to see Siren drawn later, it is the movie announcement. The contrast is delightful: the great being that left such unease in the main story reappears laughing as if playing with the three at the water's edge.
Frequently asked questions
Which volume of the collected editions contains Siren's final scene?
It is near the end of "Today, Forever Farewell," the Island Arc in volume 8. Siren appears before the islanders with a Mermaid on its head, and at the end its light singing voice overlaps with the Mermaid's.
Does Siren appear again after the final scene?
In the Island Arc's story, the scene shifts to Chiikawa and friends' last night afterward, and no epilogue for Siren itself is depicted. It does appear in a later movie announcement illustration, but it is not a continuation of the main story.
Why was Siren pursuing the islanders?
Because one of the Mermaids it sang with and spent every day alongside was lost, and it believed someone on the island was involved. Its feelings for the lost companion turned into a pursuit that engulfed the entire island.