A seventeen-year-old Japanese schoolgirl who acts as the mother-figure and breadwinner in her family due to her mother being in poor health, and therefore unable to care for her and her younger twin brothers. She works at a convienince store and lives a normal life until she saves the infamous mobster Hak Lung from Hong Kong. Instantly attracted to him, Kurumi is whisked away to Hong Kong by Hak Lung and his men, suspecting at first that she was only being rewarded for her efforts and would return home the following day. In reality, Hak Lung was just as attracted to her as she was to him, and wanted her to remain at his side, promising that her family back in Japan would be well taken care of in her absence.
Kurumi and Hak Lung lived a seemingly normal, teenage life together. The two proceeded to live in Hak Lung's flat and attend Hak Lung's school. Kurumi becomes acquainted with some of Hak Lung's most trusted men, the Four Celestial Kings, and finds friendship in one such member; the cross-dressing Fo Lung. Eventually, she goes on to make friends with the beautiful Lai Lan, but is generally not accepted by her peers, being looked down on due to her nationality and relationship with Hak Lung, who sits at the top of the popularity (and internal) latter within the school.
Hak Lung called Kurumi his "airen," meaning "lover" on a closer, more intimate scale.
Although well aware of Hak Lung's status as the leader of a Hong Kong mafia organization, for a good portion of the series, Kurumi remains in the dark about the inner, brutal workings of such groups.