Keiko Totsugawa, alias Pink Lovely Doom (麗しき破滅の桃), works alongside detective Kokoro Akechi as a police officer, blending routine law enforcement duties with covert operations targeting phantom thieves. Her role hinges on the strategic use of memory-altering Toys, enabling her to erase evidence of her presence and manipulate investigations unseen, positioning her as a shadow orchestrator within her team.

As Kokoro’s apprentice, she balances traffic patrols and public safety tasks with high-stakes collaboration on cases, analyzing crime scenes and pursuing suspects. During coordinated phantom thief attacks, she aids in evidence collection, operational planning, and real-time coordination, ensuring seamless teamwork amid chaos.

Her alias Pink Lovely Doom—translated as "Uruwashiki Hametsu no Momo"—embodies her dual identity: the elegance ("uruwashiki") of a disciplined officer contrasts with the calculated destruction ("hametsu") of her covert manipulations, reflecting her ability to navigate both lawful duty and hidden influence.