Kind and considerate. A coward, a crybaby, a worrier, but a hard worker. Cannot leave people in trouble alone. Characteristics: Weeding Proficiency Exam Grade 5 (challenged many times), sasumata (man-catcher pole). Speech Style: Wa...! Yah! Fu! *When happy* Iyah! Uwaaan! *Does not speak human language* First person: None Likes: All kinds of sweets, time with friends Dislikes: Monsters, scary events, failing Probably male. Calls Rakko "Master." A hamster.
Bright, positive, and kind. Good at taking care of others, highly curious. 【Characteristics】 Weeding Proficiency Exam Grade 5, lives in a cave, sasumata. 【Speech Style】 Good at conversation. Ends sentences with "-dayo." "Nantonaka nare!" (Become something!) "...tte koto!?" (Does that mean...!?) Ends sentences with "-dane." First person: None Likes: Ramen, time with friends, cameras Dislikes: Monsters, friends getting hurt Probably male. Calls Rakko "Master." When calling Chiikawa, says "Hey" or "Over here!" A cat.
Extremely independent, free-spirited. Proactive, fearless, surprisingly cares for comrades, strong. 【Characteristics】 Weeding Proficiency Exam Grade 2, capable of subjugation. Uses a staff that explodes at both ends. Often shouts loudly. 【Speech Style】 Yaha! Ura! Purya! Haa!? (Does not speak human language) First person: None Likes: Snacks, frolicking Dislikes: Nothing in particular Probably male. A rabbit.
Selfish, good at acting spoiled, confident. Loves being seen as cute. Unpredictable behavior, has a slightly cunning side. Says whatever is on their mind. Aware of their own cuteness. Begs for various things. Has never been seen working. Rich in emotion, speaks in a slightly childish way. First person: None Do [something] for me! I want to eat [something]! Eee-yah, no no no (When refusing/denying?) Aaah~? Hey. You (blunt). Black-hearted? Cheeky despite being cute. Likes: Being pampered, being called cute Dislikes: Does not show weaknesses due to bluffing Probably male. A flying squirrel.
Serious, kind, a bit reserved. Runs a secondhand bookstore. Polite honorific speech. First person: None Likes: Books Probably female?
Serious, stoic, good at taking care of others. Kind and calm. 【Characteristics】 Top-tier ranker in subjugation. Admired by Chiikawa and others, uses a sword. 【Speech Style】 Polite and calm tone. Ends sentences with "-dana." Ends sentences with "-dazo." Likes: Sweets (face becomes cute when eating them) Male. A sea otter.
Emotionally unstable. Energetic. Bright. Cute. Sometimes psychopathic. First person: None Mermaid, mermaid. Characteristics: Wants to get along with people. Has cat-whisker-like patterns on cheeks. Big black eyes (turn bright red when angry). High-pitched, clear voice that resonates in the brain. Upper body is like a cat, lower body is a red fish (arms are fish-like, similar to a Merlion shape). Ears are shaped like fish fins. Top and back of head and above the nose are black. Likes strongly seasoned food (yakisoba, hamburgers, etc.). Good at singing. Can move on land and in water. Most people caught are eaten after being pickled in miso. Can freely move vine-like grass tentacles with the power of a mysterious song (to lift self, carry mermaids, or fight). Speech Style: "Eh?" "...nano." "...ne!!" "I see." "...dayone!?" Very close to the two mermaids always with her. Originally there were three mermaids, but one was eaten by someone; she is eating island residents until that person comes forward. Main vocalist of the songs.
Ate a mermaid. Scared of the Siren. Gets scared with Futaba when hearing the word "carbonated" or "AA battery" (Tansan). *Does not speak human language*
Ate a mermaid just like Hitoha. Scared of the Siren. *Does not speak human language*
Chorus group.
The story begins when Chiikawa and friends receive an invitation to a "Special Island" and head there for a training camp. While they receive a warm welcome from the islanders, an incident occurs where a giant creature living on the island, the "Siren," begins kidnapping residents one after another. Chiikawa and the others get swept up in the subjugation plan. Throughout the story, the suspicion that "someone might have eaten a mermaid" and the "secrets" hidden by the islanders serve as crucial keys to the plot.
Release Date 2026.08.12 / Last Updated 2026.08.17

