Matsuno Chifuyu and Baji Keisuke.
The story of two people that was not revealed in the main story is complete.

The past that the pants left behind―.
Chifuyu and her companions storm the Shin Yotsuya Phantom's hideout to confront Kensho.
However, the "surprise attack" planned by Kojiro in collaboration with Kensho ends up in a desperate situation.
Chifuyu, Baji, and Ryuusei, the paths they each chose to protect their comrades and the future—.