Kanna Takaoka

She and her mother move in with her grandpa. Her father is deceased. She is a student at the story's start. [Spoiler] At the start of the second volume, she is believed to be dead. Her death is faked though. She's alive and being used as a sex slave in secret. She is freed by the end of the story. [/Spoiler] [Spoiler] At the end of the story, she and Daichi have a daughter together. [/Spoiler]