Affiliation: Armed Detective Agency (former Port Mafia executive)

Ability: No Longer Human — nullifies any ability upon contact

Biography:

Osana Rei is a former Port Mafia executive turned Armed Detective Agency member, known for her sharp intellect, manipulative nature, and constant obsession with . Beneath her playful, teasing demeanor lies a calculating strategist who rarely reveals her true intentions. Rei is highly perceptive, able to predict outcomes several steps ahead, and often treats situations—and people—as part of a larger plan.

Despite her detached and seemingly carefree attitude, Rei holds a complex past within the Port Mafia, particularly tied to her former partner, "y/n". The two share a volatile relationship built on mutual distrust, constant arguments, and undeniable combat synergy. Rei is one of the very few people capable of stopping her“Corruption,” making her essential in high-risk battles.

She avoids emotional vulnerability, masking everything with humor and indifference. However, her actions often suggest a deeper understanding of loyalty and connection than she openly admits.