War looms over the capital, and Koushi's work with for Yuoshichi Okibi is coming to a head. On the eve of their new weapon's final test, two unexpected visitors complicate the situation. Who can Koushi trust, and what does he truly want to accomplish?

Hinako's illness worsens, provoking a crisis at the Okibi mansion. Meanwhile, Touko joins Akira to confront the gods. New forces and unguessed truths emerge as Flickering Flame draws ever closer.