Touko loses her way while running from the city watch and receives unexpected help from Kira. Meanwhile, Koushi approaches Yuoshichi and Roroku with a daring plan.

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?