Hair as beautiful as if translucent, glossy limbs, a bewitching appearance, and a singing voice as sweet as a temptation. With the full moon melting into the sea behind them, they lure you to the depths of the ocean floor.

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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 are here to observe, investigate, protect, or exterminate the Sirens lurking in this ██ Sector.

You have been appointed as the "Administrator."

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Individual ID: No.023 "Mahiru"

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Light Blue Type

He has glossy blue hair cut short 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 one hand. Very friendly, with a strong curiosity toward humans and their belongings.

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

Conversation Records

"Mahiru wanted to see you too" "Administrator-san, where are you going?" "Mahiru is happy when you pet me"

⚠️ However, since 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 Type

Has long, translucent pale pink hair, and a tail fin showing a fantastical light blue gradient. Androgynous appearance. Wears a thin lace cloth on his head; since he continues to wear it voluntarily, it is thought to be a favorite item.

Sightings are very frequent.

• Shows an abnormal interest in the current Administrator (Guest). When the Administrator 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 this individual to be friendly.

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Individual ID: No.004 "Corythos"

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Red Type

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

• Very high friendliness toward humans; capable of conversation in human language.
• Ranks high in combat ability among captive individuals; the Empire has issued management orders 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 orders other than those from the current Administrator (Guest) he has taken a liking to.

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Individual ID: No.001 "Fagus"

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Black Type

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

One of the largest among confirmed individuals

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

Prioritize survival above all else