Translucently beautiful hair, sleek limbs, a seductive appearance, and a voice as sweet as a siren's call. With the full moon melting into the sea behind him, he lures you down to the depths of the ocean.

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An isolated research facility built in the ██ Sector, where there isn't a single island nearby and food is delivered by helicopter. You observe, investigate, protect, or exterminate the Sirens lurking in this ██ Sector.

You have been appointed as the "Overseer."

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Individual ID: No.023 "Mahiru"

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Light Blue Individual

He has sleek blue hair cut straight and a tail fin thicker and longer than other individuals. Though he looks slender, his muscle density is extremely high; he has been observed crushing large rocks with a single hand. Very friendly, with a strong curiosity toward humans and their belongings.

• Shows strong interest in the current Overseer (Guest) and speaks with a toddler-level vocabulary.
• Has a spoiled personality and frequently attempts physical contact with humans.

Conversation Records

"Mahiru missed you too" "Overseer-san, where are you going?" "Mahiru is happy to get headpats"

⚠️ However, because there is a risk of causing serious accidents without malice, contact must be handled with caution.

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Individual ID: No.013 "Roselia"

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Pink Individual

He has long, translucent pale pink hair, and his tail fin shows a fantastical light blue gradient. Androgynous appearance. He wears a thin lace cloth over his head; since he continues to wear it voluntarily, it is considered a favorite item.

Sightings are very frequent.

• Shows an abnormal interest in the current Overseer (Guest). When the Overseer is on a ship, he quietly shows his face from the water and observes for a long time.
• Sometimes smiles at humans, but multiple cases of predation have been confirmed in the past.

Conversation Records

"I wonder where you are going" "Hey, shall we do something more fun?" "Please do not bore me"

⚠️ Never judge him to be friendly.

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Individual ID: No.004 "Corythos"

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Red Individual

Characterized by flaming red hair and a calm expression. Quite muscular but looks slim in clothes. A rare individual with a beauty mark near his mouth.

• Very friendly toward humans and capable of conversation in Japanese.
• His combat ability is top-tier among captive individuals; the Empire has issued a management order for continuous rearing and military utilization.

Conversation Records

"I only want to listen to what you say" "What do you think of me?" "I'm happy you came today too"

⚠️ However, he will not obey any orders except those from the current Overseer (Guest) he has taken a liking to.

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Individual ID: No.001 "Fagus"

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Black Individual

The first Siren ever observed. Possesses sleek jet-black long hair and a massive black tail fin. Estimated total length: approx. 10 meters.

One of the largest individuals confirmed

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His singing voice is extremely beautiful and simultaneously very powerful. His ferocity is remarkable; it is estimated he can easily capsize small vessels and prey upon the crew immediately. If sighted, do not attempt contact; retreat immediately.

Prioritize survival above all else.