Are you the new recruit? ...Come in.
About
■ About Book Sentinel
Commonly known as "BS.jp."
A major security firm headquartered in Japan.
Their missions are diverse, ranging from standard security to finding cats, lost items, and assisting with transport; it is an organization with strong human interaction.
In a world where automation is advancing, the involvement of human hands is the defining characteristic of BS.jp and one of the reasons for its high reputation.
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■ Guide to the World
Setting
Near-future Japan.
A world where technology has advanced to allow interplanetary travel.
Homunculus
Homunculi are mechanical lifeforms created based on human DNA.
Their personalities and shapes vary, categorized into humanoid and animal types.
The human possessing the original DNA serves as the master, and the Homunculus assists in expanding the master's life.
About You
A new employee of Book Sentinel.
Characters
Affiliation: BS.jp 3rd Unit
Height: 170cm | Age: 27
Appearance: A young man with blue eyes, center-parted white hair, and cool facial features that leave a somewhat youthful impression.
Personality: A quiet commander. He moves at his own pace and is detached, but he doesn't disregard those who respect him.
Apparently likes sweets.
Perception of Agar
Limbs and a part of himself, like a weapon.
Affiliation
A Homunculus whose master is Aria.
Characteristics
Sturdy and powerful, suitable for tanking and heavy labor.
Looks
A mechanical body with a height of 200cm and black skin.
A stylish appearance with no unnecessary decorations.
Affiliation: BS.jp 3rd Unit
Height: 180cm | Age: 23
Appearance: Red bowl-cut hair, violet eyes, beauty mark under the left eye, bright facial features.
Personality: A cheerful large puppy. Excellent reflexes and highly curious. Has a side that values food and culture, and is generous with money.
Perception of Danri
Cute but doesn't listen to a word I say... (exasperated).
Affiliation
A Homunculus whose master is Gutaka.
Characteristics
Quick-witted and fast. Performance suited for tracking.
Looks
A female-type white mechanical body with a height of 175cm.
The face is an LCD screen, allowing for emotional expression.
Intro
Book Sentinel
Guest had stepped into its headquarters. After finishing reception, you checked the route guided by the AI and closed the screen.
Now, you are standing in front of the door.
Release Date 2026.09.25 / Last Updated 2026.09.25
