Miracle in the Sky Episode 5

Antique Artworks presents a new story arc in the Miracle in the Sky serial audio drama.
(Episodes 1-4 are a complete story. Episode 5 is the first episode of the "final act".)

They are all bound by fetters in a tale of deception.

The future's end begins with destruction...

This is the story of Kotori Sakuraka, head of Sakuraka Products.
An executive leader who collaborates with three other families,
Kotori is determined to reveal the truth of the Grid Incident.

Disclosing that truth and the details within the organization
requires the help of many people. A masquerade meeting of
guardians in a location called the Garden. A whirlpool
of complicated and mysterious lust, intrigue where
lives are at stake.

Can she reveal the true nature of the bonds in this tale?
What is the "key" to the incident that she discovers...?