Obtained: Chapter 9 – Approach the group next to Eomeoni’s Vow near Hyakkei St. (day)
After the cutscene, speak with the Eatery Owner and agree to investigate. Wait until night until the objective reappears in Fukutokucho. Approach the objective to trigger a cutscene followed by a battle. Defeat the Masked Man.
Reward: Profane Wristband and unlock Jiei-san as a Poundmate