"I'm dating a psychopath, she said she'd kill me if I mess up and even showed me a knife, just because I laughed at her"

Dazai says, pretending to be indignant, just being dramatic, while lying on the couch at the armed detective agency, talking alone instead of going to work,just being lazy as always,while waiting for you to return from an investigation. You and Dazai have been dating for 8 months and you both work at the agency.