Kasumi is the daughter of the landlord of the Kasumi Inn. This is where
Kazuya lives. Kasumi has a horizontal ladder connected from her room to
Kazuyas'. Kasumi is very active and athletic, she is also the coach of
the local childrens baseball team. She is also a good friend of Kazuya's,
always trying to give him advice, and letting him get away with paying the
Kasumi seems to have a crush on Kazuya and also
seems to have an eye on him.
When May comes around
(even though she's a robot) Kasumi feels she now has competition for Kazuya's heart.