A Family Needs a Mother

Ushio never inherited Nagisa's mysterious disease and is living happy and healthy. She is now in grade school. One day, Kyou along with Ryou stopped by the Okazaki residence to pay them a visit. Afterwards, Kyou starts to visit Tomoya and Ushio more often, but will she just remain a friend with them, or will the Okazakis start to see her as someone more than just a friend?