(y/n) (l/n) is the grand-daughter of the former boss's sibling. as part of his will, (y/n) was to inherit a position as an executive, with her own brother as the boss. however, her parents and siblings met with an accident, she fled to france to live with her aunt. after she received a letter through mori, inviting her to consider joining the port mafia, she travels back to yokohama, japan at the age of tweny. she is escorted to the port mafia by a certain ginger haired male; who later becomes her partner during missions. after her arrival to yokohama, she uncovers the truth about her family, all while balancing her life as a member of the mafia and her blossoming relationship with nakahara chuuya.