The Clavis and Its Consequences
5 Centimeters per SecondThis thread follows the clavis from a hidden key to a contested instrument whose power links entry, resurrection, and the protection of living people.
increasing
Bearing strength in each event
decreasing
A Crystal in the Radio

A Crystal in the Radio
An inherited object
Asuna uses a blue crystal, one of the few physical mementos of her father, as part of her homemade radio.
She values it for the memories attached to it and does not know that it belongs to a larger system.
A hidden identity
When Shun sees the crystal, he recognizes it as a clavis fragment but cannot finish explaining before Asuna tunes in a song.
The ordinary object that supports her private refuge is also a key to Agartha.
The Gate Opens

The Gate Opens
A contested fragment
Morisaki’s pursuers demand the clavis, treating it as the route to knowledge hidden underground.
Shin also seeks to recover a clavis, while Asuna does not yet understand why her own crystal matters.
Entry into Agartha
The fragment responds to a glowing mark in the rock, opening the passage that the armed group could not breach.
Its power turns Asuna from an accidental witness into the person whose possession makes the journey possible.
The Fragment Revealed

The Fragment Revealed
Recognition in the sky
Morisaki identifies Asuna’s crystal as a fragment of a clavis when it shines beneath the underground sky.
The discovery connects her father’s keepsake to the ancient mechanisms of Agartha.
A burden of value
Morisaki tells her to protect it, and the travelers continue toward the route indicated by the Shakuna Vimana.
Asuna’s treasured possession now carries a consequence that exceeds her understanding or control.
The God’s Demand

The God’s Demand
A wish answered
Morisaki places the clavis on the pedestal and asks for Lisa to return.
The Gate responds by shaping a figure from Vita-aqua, but makes the return dependent on a living vessel.
The consequence appears
Lisa’s manifestation through Asuna reveals that the clavis does not grant a clean restoration.
The instrument connects Morisaki’s private grief to Asuna’s immediate bodily danger.
The Key Destroyed

The Key Destroyed
Shin’s intervention
Shin attacks the clavis with the short sword his brother gave him, refusing to let Asuna disappear into Lisa’s return.
The crystal resists repeated blows, making his effort a physical expression of the bond he has chosen to protect.
A broken mechanism
At last the clavis shatters, and Lisa’s manifestation ends as Asuna returns to herself.
The destruction closes the immediate crisis without providing an easy answer to grief or resurrection.
Before Asuna meets Shun
During the pursuit near Mount Obuchi
After the travelers reach the underground landscape
At the Gate of Life and Death
Moments after Lisa manifests through Asuna