Makoto was raised by her grandfather as a boy because she possessed male genitalia. However, with the onset of puberty, Makoto also started to develop breasts and so learned that she is a fertile and fully functional hermaphrodite. At the start of the manga, Makoto looks, when fully clothed, like a tall, beautiful girl, and she has adopted female mannerisms—although she continues to use boku for "I", which is usually used only by boys and young men. Makoto is unusually strong and athletic, but somewhat naive because of her sheltered upbringing. She is caught unaware when she first develops physical attraction to other people, and her attempts to deal with her sexuality is played for both humor and drama.

She initiates romantic/sexual relationships with four individuals over the course of the story, but in the end seems to realise that her true attraction is to Hiromi. At the very end of the story, it is implied that the two will be in a relationship with each other.
Near the end of the manga, Makoto learns that she is half-alien. When an alien research spacecraft visited Earth, her mother had a relationship with one of the researchers—a member of a humanoid race which is naturally hermaphroditic. All Makoto's unusual characteristics can apparently be traced back to her "sire."

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