She is a bodacious office lady who resides at Kawai Complex as one of its tenants. Besides her on-and-off relationship with her supposed husband Kenji, she often finds herself getting into a lot of other relationships that eventually fail.

Mayumi has a habit of getting drunk. As a result, she often does crazy things, cusses, and just hits everyone who happens to be in striking distance when she's in a bad mood. She enjoys teasing Usa a lot.

(Source: Anime+)